Appendix 1 Descriptions of the GIS Geologic Units, Greater Green River Basin, Wyoming, Colorado, and Utah

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Appendix 1 Descriptions of the GIS geologic units, Greater Green River Basin, Wyoming, Colorado, and Utah – for Plate 2

10-1 his appendix describes the 171 Geographic Information System (GIS) geologic units (including surface water) that compose the Greater Green River Basin of Wyoming, Colorado, and Utah – including the Great Divide and Little Snake River basins (Plate 2). The stratigraphic descrip- Ttions in this appendix are for the units shown on Plate 2. The GIS geologic units are ordered as follows:

Wyoming 105 GIS units page 10-2 Colorado 40 GIS units page 10-21 Utah 25 GIS units page 10-29

These geologic units are compiled from those parts of the three 1:500,000-scale digital state maps that cover the GGRB. These maps give a code and rock-type description for each unit within the mapped state: each state has its own set of codes, and neither codes nor unit boundaries necessarily match across state borders. In this appendix, for each state, each GIS code and rock-type citation in italics is followed by a description of the corresponding geologic units and rock-stratigraphic units as defined in that state. Plate 7 summarizes these determinations. The abbreviationMa denotes mega annum or million years before present. greater Green River Basin geologic units – Wyoming There are 105 digital GIS geologic units in the Wyoming Greater Green River Basin, including surface water and ice units (Love and Christiansen, 1985; Stoeser et al., 2005). The stratigraphic descriptions below are taken directly from Love and Christiansen (1985) with minor additions.

References Love, J.D., and Christiansen, A.C., compilers, 1985, Geologic map of Wyoming: U.S. Geological Survey, scale 1:500,000, 3 sheets.

Love, J.D., Christiansen, A.C., and Ver Ploeg, A.J., compilers, 1993, Stratigraphic chart showing the Phanerozoic nomenclature for the state of Wyoming: Geological Survey of Wyoming Map Series 41 (MS-41).

Stoeser, D.B., Green, G.N., Morath, L.C., Heran, W.D., Wilson, A.B., Moore, D.W., Van Gosen, B.S., 2005, Preliminary integrated geologic map databases for the United States Central States – Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana: U.S. Geological Survey Open-File Report 2005-1351. [Includes both Wyoming and Colorado at 1:500,000-scale, though different states within this database have different scales.]

Unit symbol Unit description Cenozoic geologic units, Wyoming Quaternary geologic units, Wyoming

Water Water [surface water]

Ice Ice [glacial ice only mapped in Wind River Range of this study area]

Qa Quaternary: Pleistocene-Holocene: alluvium and colluvium deposits. Alluvium and colluvium (Qa) (Pleistocene to Holocene) – Clay, silt, sand, and gravel present in flood plains, fans, terraces, and slopes (Love and Christiansen, 1985).

10-2 Qls Quaternary: Pleistocene-Holocene: landslide and glacial drift deposits. Landslide deposits (Qls) (Pleistocene to Holocene) – Locally includes intermixed landslide and glacial deposits, talus, and rock-glacier deposits (Love and Christiansen, 1985). [Exposed in scattered areas and along highlands in the Wyoming GGRB.]

Qs Quaternary: Pleistocene-Holocene: dune sand and loess deposits (eolian deposits). Dune sand and loess (Qs) (Pleistocene to Holocene) – Includes active and dormant sand dunes and in northwestern Wyoming is chiefly loess (12,000-19,000 years old) (Love and Christiansen, 1985).

Ql Quaternary: Pleistocene-Holocene: playa lake or marine deposit (nonglacial). Playa lake and other lacustrine deposits (Ql) (Pleistocene to Holocene) – Chiefly clay, silt, and fine sand. Includes travertine deposits (Love and Christiansen, 1985). [Exposed mostly in the Great Divide Basin and in a few outcrops north of the Rock Springs Uplift.]

Qg Quaternary: Pleistocene-Holocene: glacial drift deposits. Glacial deposits (Qg) (Pleistocene to Holocene) – Till and outwash of sand, gravel, and boulders (Love and Christiansen, 1985). [Exposed in the northern Overthrust Belt, Wind River Range, northern flank of the Uinta Mountains, and in a few outcrops in the Sierra Madre.]

Qi Quaternary: alkalic volcanic rock and alkalic intrusive igneous rock units. Alkalic extrusive and intrusive igneous rocks (Qi) (Pleistocene, 1.25 Ma) – Consists of leucite- and nepheline-rich flows, scoria, and necks (Love and Christiansen, 1985). [Exposed in the Leucite Hills located in the northern Rock Springs Uplift.]

Qt Quaternary: Pleistocene-Holocene: unconsolidated deposit. Gravel, pediment, and fan deposits (Qt) (Pleistocene to Holocene) – Composed mostly locally derived clasts; includes some glacial deposits along flanks of Wind River Range; and locally may include some Tertiary gravels (Love and Christiansen, 1985). [Exposed in the northern and western Green River Basin, Great Divide Basin, and in a few outcrops in the Washakie Basin.]

Qu Quaternary: Pleistocene-Holocene: alluvium and colluvium deposits. Undivided surficial deposits (Qu) (Pleistocene to Holocene) – Mostly alluvium, colluvium, and glacial and landslide deposits (Love and Christiansen, 1985). [Exposed on the northern flank of the Uinta Mountains and mostly within eastern Uinta County and a small area of adjacent Sweetwater County.]

QTg Tertiary-Quaternary: Pliocene-Pleistocene: gravel deposit. Terrace gravel (QTg) (Pliocene(?) to Pleistocene) – Partly consolidated gravel above and flanking some major streams (Love and Christiansen, 1985). [The terrace gravel unit is exposed in the southern Green River Basin (Bridger Valley area).]

10-3 Upper Tertiary geologic units, Wyoming

Tmu Tertiary: Upper Miocene: sandstone and claystone. Upper Miocene rocks (undivided) (Tmu) Upper Miocene rocks (Tmu) – South end of Wind River Range – Siliceous, arkosic, and locally radioactive sandstone, claystone, and conglomerate. Fission- track age ~27 Ma. Recent work suggests that part of these deposits may be of Eocene age. These rocks were originally defined as the Miocene-Pliocene South Pass Formation (Love and Christiansen, 1985). [Exposed only in the South Pass area at the southern end of the Wind River Range.]

Tm Tertiary: Miocene: sandstone and conglomerate. Miocene rocks (undivided) (Tm) Miocene rocks (Tm) – Southern Rock Springs Uplift – Pale-green to tan tuffaceous sandstone and claystone of Miocene(?) age. Conglomerate of uncertain correlation locally present at the base (Love and Christiansen, 1985). Miocene rocks (Tm) – [Exposed on the west flank of Sierra Madre and southwest into Colorado; in a few small outcrops in the Great Divide and Washakie basins.] – White massive soft tuffaceous sandstone and lesser amounts of white marl; lower part conglomeratic. To the west and southwest called the Browns Park Formation (Love and Christiansen, 1985). Miocene rocks (Tm) – Rawlins Uplift area – White massive soft tuffaceous sandstone (Love and Christiansen, 1985). Miocene rocks (Tm) – [South Pass area at southern end of the Wind River Range] – White soft tuffaceous sandstone. Locally derived conglomerate in upper and lower parts of sequence; in places lower conglomeratic sequence may be of Oligocene age (Love and Christiansen, 1985).

Tbf Tertiary: Miocene: basalt. Basalt flows and intrusive igneous rocks (Tbf) (Miocene, ~11 Ma) – West side of Sierra Madre (Love and Christiansen, 1985). [This unit is only exposed on the western flank of the Sierra Madre uplift in southwestern Carbon County, and it is time-equivalent to the Browns Park Formation in that area.]

Lower Tertiary geologic units, Wyoming

Tbi Tertiary: Oligocene: conglomerate. Bishop Conglomerate (Tbi) (Oligocene) – Clasts of red quartzite, gray chert, and limestone in a gray to white tuffaceous sandstone matrix (Love and Christiansen, 1985). [Bishop Conglomerate is stratigraphically equivalent to the Oligocene White River Formation elsewhere in Wyoming. The conglomerate is exposed in the southern Rock Springs Uplift and southern Green River Basin (Bridger Valley area).]

Twru Tertiary: Oligocene: medium-grained mixed clastic and conglomerate. White River Formation: Upper conglomerate member (Twru) (Oligocene) – Light-gray soft conglomeratic tuffaceous sandstone and conglomerate of Precambrian clasts (Love and Christiansen, 1985). [Exposed only in a few outcrops that are located in the Wind River Range area and the northern Green River Basin.]

10-4 Twr Tertiary: Oligocene: fine-grained mixed clastic and medium-grained mixed clastic. White River Formation (Twr) (Oligocene, 31-35 Ma) – White to pale-pink blocky tuffaceous claystone and lenticular arkosic conglomerate (Love and Christiansen, 1985). [Exposed only in a few outcrops that are located in the northern Great Divide Basin in northeastern Sweetwater County.]

Toe Tertiary: Eocene-Oligocene: mixed clastic/volcanic and medium-grained mixed clastic. Oligocene and/or Upper and Middle Eocene rocks (Toe) (Middle Eocene to Oligocene) – Light-gray tuff, arkosic sandstone, and lenticular conglomerate (Love and Chris- tiansen, 1985). [This unit is exposed mostly in one large outcrop area located along the southern flank of the Wind River Range and in the northern Green River Basin.]

Tip Tertiary: Eocene: conglomerate. Ice Point Conglomerate (Tip) (Eocene) – Reddish-brown conglomerate, chiefly of Paleozoic rock fragments (Love and Christiansen, 1985). [The Ice Point Conglomerate is exposed in a few outcrops in the northern Great Divide Basin along the line between Fremont and Sweetwater counties.]

Twa Tertiary: Eocene: medium-grained mixed clastic and fine-grained mixed clastic. Washakie Formation (Twa) (Eocene, ~43-44 Ma) – Gray, green, tan, and dull-red tuffaceous arkosic sandstone and claystone (Love and Christiansen, 1985). [The Washakie Formation is exposed in the Washakie Basin in southeastern Sweetwater County.]

Tb Tertiary: Eocene: fine-grained mixed clastic and mixed clastic/volcanic. Bridger Formation (Tb) (Eocene) – Greenish-gray, olive-drab, and white tuffaceous sandstone and claystone; lenticular marlstone and conglomerate (Love and Christiansen, 1985). [The Bridger Formation is mostly exposed in the southern Green River structural basin (including the Bridger Basin), but is also present in outcrops in the northern Rock Springs Uplift, southern Wind River Mountains, and northern Great Divide Basin.]

Tcg Tertiary: Eocene: conglomerate. Crooks Gap Conglomerate (Tcg) (Early to Middle Eocene-Oligocene(?)) – Giant boulders [blocks] of granite in arkosic sandstone matrix. Reynolds (1976) considers eastern exposures to be Oligocene(?) (Love and Christiansen, 1985). [Exposed along the northern margin of the Great Divide Basin and mostly in southeastern Fremont County.]

Tgl Tertiary: Eocene: oil shale and mixed clastic/carbonate. Green River Formation: Laney Member (Tgl) (Eocene, ~45 Ma) – Oil shale and marlstone (Love and Christiansen, 1985). [Exposed mostly in the Green River Basin, Washakie Basin, and in a few outcrops north of the Rock Springs Uplift, southern Wind River Range, and northern Great Divide Basin.]

Tgw Tertiary: Eocene: fine-grained mixed clastic and mixed clastic/carbonate. Green River Formation: Wilkins Peak Member (Tgw) (Eocene, ~49 Ma) – Green, brown, and gray tuffaceous sandstone, shale, and marlstone; contains evaporite minerals (including trona) in subsurface (Love and Christiansen, 1985). [Exposed in the western Green River Basin, western and northern Washakie Basin, and in a few outcrops in the northern Rock Springs Uplift.]

10-5 Tgwt Tertiary: Eocene: mixed clastic/carbonate and fine-grained mixed clastic. Green River Formation: Wilkins Peak Member and Tipton Shale Member or Tongue (Tgwt) (Eocene) – Two members mapped as a single undivided unit (Love and Chris- tiansen, 1985). [Exposed in the eastern Green River structural basin, southeast of the Rock Springs Uplift, and in the western Washakie Basin.] Wilkins Peak Member (~49 Ma) – Green, brown, and gray tuffaceous sandstone, shale, and marlstone; contains evaporite minerals (including trona) in subsurface (Love and Christiansen, 1985). Tipton Shale Member or Tongue – Oil shale and marlstone (Love and Chris- tiansen, 1985).

Tgt Tertiary: Eocene: oil shale and mixed clastic/carbonate. Green River Formation: Tipton Shale Member or Tongue (Tgt) (Eocene) – Oil shale and marlstone (Love and Christiansen, 1985). [Exposed in the northern Great Divide Basin and on the southwestern, northern, and eastern margins of the Washakie Basin.]

Tglu Tertiary: Eocene: fine-grained mixed clastic and oil shale. Green River Formation: Luman Tongue (Tglu) (Eocene) – Oil shale, carbonaceous shale, and sandstone (Love and Christiansen, 1985). [Exposed in the central Great Di- vide Basin and along the southwestern to northeastern margins of Washakie Basin.]

Tgrw Tertiary: Eocene: mudstone and sandstone. Green River and Wasatch Formations (Tgrw) (Eocene) [Exposed in the southern Over- thrust Belt (Fossil Basin area) and western Green River structural basin.] Green River Formation – Buff laminated marlstone and limestone, brown oil shale, and siltstone; includes Angelo Member and Fossil Butte Member (Love and Christiansen, 1985). Wasatch Formation – Variegated mudstone and sandstone; includes Tunp Member and Bullpen Member, other tongues and unnamed members, and the main body of the Wasatch Formation (Love and Christiansen, 1985).

Tgc Tertiary: Eocene: conglomerate. Granitic conglomerate above or in upper part of Wasatch (Tgc) (Eocene) – Giant granite boulders and blocks in an arkosic sandstone matrix. Occurs along western flank of Wind River Range (Love and Christiansen, 1985). [Exposed in a few outcrops in northern Green River Basin in Sublette County.]

Twc Tertiary: Eocene: fine-grained mixed clastic and medium-grained mixed clastic. Wasatch Formation: Cathedral Bluffs Tongue (Twc) (Eocene) – Variegated claystone and lenticular sandstone; conglomeratic near southern flank of Wind River Range (Love and Christiansen, 1985). [Exposed mostly in the northern Great Divide Basin, on the margins of the Washakie Basin, and in a few scattered outcrops in Green River Basin.]

Twn Tertiary: Eocene: sandstone and shale. Wasatch Formation: Niland Tongue (Twn) (Eocene) – Brown sandstone, carbonaceous shale, and coal (Love and Christiansen, 1985). [Exposed in the northwestern Green River Basin and east of the Overthrust Belt.]

10-6 Twd Tertiary: Eocene: clastic and medium-grained mixed clastic. Wasatch Formation: Diamictite and sandstone (Twd) (Eocene) – Diamictite and sandstone grades laterally into other members of the formation (Love and Christiansen, 1985). [Exposed along the eastern Overthrust Belt and northwestern Green River Basin in Lincoln and Sublette counties.]

Twlc Tertiary: Paleocene-Eocene: mudstone and conglomerate. Wasatch Formation: La Barge and Chappo Members (Twlc) (Paleocene to Eocene) – Red, gray, and brown mudstone and conglomerate and yellow sandstone. La Barge Member tongues out to north at about T35N. The lower part of Chappo Member is Paleocene (Love and Christiansen, 1985). [Exposed in the northwestern Green River Basin and east of the Overthrust Belt.]

Twg Tertiary: Eocene: fine-grained mixed clastic and mixed clastic/carbonate. Wasatch and Green River Formations: New Fork Tongue of Wasatch and Fontenelle Tongue or Member of Green River (Twg) (Eocene) – may be redefined as Alkali Creek Tongue (Roehler, 1991, p. B4). [Crops out in northern Green River Basin in Lincoln and Sublette counties.] Wasatch Formation: New Fork Tongue – Dull red and green mudstone, brown sandstone, and thin limestone beds, merging southward in T23N with other units (Love and Christiansen, 1985). Green River Formation: Fontenelle Tongue or Member – Alternating, 350-foot-thick, buff to brown, fine- to coarse-grained sandstone, thin-bedded to thick-bedded to blocky, and interbedded with green and gray mudstone as a basal member of the Green River Formation (Love and Christiansen, 1985). Roehler (1991h) redefined the stratigraphy of the Green River and Wasatch Formations, and the term Fontenelle Tongue or Member has been abandoned in favor of Tipton Shale Member (Roehler, 1991, p. B4).

Twm Tertiary: Paleocene-Eocene: sandstone and fine-grained mixed clastic. Wasatch Formation: Main body (Twm) (Paleocene to Eocene) – Drab sandstone; drab to variegated claystone and siltstone; locally derived conglomerate around basin margins. Lower part is Paleocene (Love and Christiansen, 1985). [Crops out in an encircling pattern around the Rock Springs Uplift, at the southern end of the Wind River Range, and in the Great Divide and Washakie basins.]

Tw Tertiary: Eocene: mudstone and sandstone. Main body of the Wasatch Formation (Tw) (Eocene) – Overthrust Belt – Variegated red to gray, brown, and gray mudstone and sandstone; conglomeratic lenses. Includes Tunp Member and Bullpen Member, other tongues and unnamed members (Love and Chris- tiansen, 1985). [Crops out in eastern Overthrust Belt in Uinta, Lincoln, and Sublette counties.] Wasatch Formation (Tw) (Paleocene to Eocene) – Southwest Wyoming – Drab to variegated claystone and siltstone, carbonaceous shale and coal, buff sandstone, arkose, and conglomerate. In northwestern Green River Basin is thick, arkosic, light-yellowish-tan sandstone intertonguing with pale-green to gray claystone and shale (Love and Chris- tiansen, 1985). [Crops out in western Green River Basin and eastern Overthrust Belt in Uinta, Lincoln, and Sublette counties.]

10-7 Tbw Tertiary: Eocene: medium-grained mixed clastic and fine-grained mixed clastic. Transitional unit between Battle Spring and Wasatch Formations (Tbw) (Eocene) – Contains interbedded lithologies of Battle Spring and Wasatch formations (Love and Christiansen, 1985). [Crops out as one minor exposure in northern Great Divide Basin.]

Tbs Tertiary: Paleocene-Eocene: conglomerate. Battle Spring Formation (Tbs) (Paleocene to Eocene) – Equivalent to and lithologically similar to locally derived basin-margin conglomerate of Wasatch Formation; merges southward into main body of Wasatch Formation. Lower part is Paleocene (Love and Christiansen, 1985). [Exposed in a large outcrop area in the northeastern Great Divide Basin.]

Tp Tertiary: Eocene: conglomerate and medium-grained mixed clastic. Pass Peak Formation and equivalents (Tp) (Eocene) – Includes Lookout Mountain Con- glomerate Member of Wasatch Formation. On south side of Gros Ventre Range consists of gold-bearing quartzite conglomerate; intertongues southward with sandstone and claystone of main body of Wasatch Formation (Love and Christiansen, 1985). [Exposed mostly in one minor outcrop area in northern Green River Basin and in the northern Overthrust Belt in Sublette County.]

Tep Tertiary: Paleocene-Eocene: conglomerate. Conglomerate of Roaring Creek (Tep) (Paleocene(?) to Eocene(?)) – (Eocene or Pa- leocene; older than main part of Wasatch Formation) – Red and gray conglomerate containing clasts of Mesozoic, Paleozoic, and Precambrian rocks (Love and Christiansen, 1985). [Exposed in a few outcrop areas in the northernmost Wind River Range and northern Sublette County.]

Th Tertiary: Paleocene: medium-grained mixed clastic and fine-grained mixed clastic. Hoback Formation (Th) (Paleocene) – Interbedded drab and gray sandstone and claystone. Locally contains thick beds of red and gray conglomerate (Love and Christiansen, 1985). [Exposed only in two small outcrops in the northern Green River Basin in west- central Sublette County.]

Tdb Tertiary: Paleocene: medium-grained mixed clastic and fine-grained mixed clastic. Devils Basin Formation (Tdb) (Late Paleocene) – Light-gray sandstone interbedded with green and gray claystone; sparse coal and carbonaceous shale (Love and Christiansen, 1985). [Exposed only in one small outcrop in the northern Green River Basin in north- central Sublette County; stratigraphically equivalent to the upper Fort Union Forma- tion.]

Tfu Tertiary: Paleocene: sandstone and shale. Fort Union Formation (Tfu) (Paleocene) – Light-colored massive sandstone, drab shale, and thick coal beds (Love and Christiansen, 1985). [Crops out in an encirclement pattern around the Rock Springs Uplift, along part of southern border of Sweetwater County, in the northern Great Divide Basin, and along the eastern margin of the Great Divide and Washakie basins.]

10-8 TKp Upper Cretaceous-Paleocene: conglomerate and sandstone. Pinyon Conglomerate (TKp) (Upper Cretaceous to Paleocene) – Brown gold-bearing quartzite conglomerate interbedded with brown and gray sandstone. Age of basal part ~67 Ma in northeastern Jackson Hole; farther south, entire sequence is Paleocene (Love and Christiansen, 1985). [Exposed only in two small outcrop areas in the northern Green River Basin in north-central Sublette County.]

TKe Upper Cretaceous-Paleocene: siltstone and sandstone. Evanston Formation (TKe) (Upper Cretaceous to Paleocene) – Gray siltstone, sparse red sandstone, and lignite beds (Love and Christiansen, 1985). [Exposed in the southeastern Overthrust Belt and western Green River structural basin in Uinta and Lincoln counties.]

Mesozoic geologic units, Wyoming Upper Cretaceous geologic units, Wyoming

Kl Upper Cretaceous: sandstone and shale. Lance Formation (Kl) (Upper Cretaceous) – Brown and gray sandstone and shale; thin coal and carbonaceous shale beds (Love and Christiansen, 1985). [Exposed in the eastern Rock Springs Uplift and eastern Great Divide and Washakie basins.]

Kfh Upper Cretaceous: sandstone and shale. Fox Hills Sandstone (Kfh) (Upper Cretaceous) – Light-colored sandstone and gray sandy shale containing marine fossils (Love and Christiansen, 1985). [Exposed only in one small outcrop area in the eastern Great Divide Basin.]

Kfl Upper Cretaceous: sandstone and shale. Fox Hills Sandstone and Lewis Shale (Kfl) (Upper Cretaceous) – [Exposed along the eastern flank of Rock Springs Uplift and in a few small outcrop areas in the eastern Great Divide Basin.] Fox Hills Sandstone – Light-colored sandstone and gray sandy shale containing marine fossils (Love and Christiansen, 1985). Lewis Shale – Gray marine shale containing many gray and brown lenticular concretion-rich sandstone beds (Love and Christiansen, 1985).

Kle Upper Cretaceous: shale and sandstone. Lewis Shale (Kle) (Upper Cretaceous, ~68 Ma) – Gray marine shale containing many gray and brown lenticular concretion-rich sandstone beds (Love and Christiansen, 1985). [Exposed in the eastern Great Divide and Washakie basins, northern Rock Springs Uplift, and between southeastern Rock Springs Uplift and Washakie Basin.]

Kmv Upper Cretaceous: sandstone and shale. Mesaverde Group (Kmv) (Upper Cretaceous) – On the Rawlins uplift, includes Almond Formation, Pine Ridge Sandstone, Allen Ridge Formation, and Haystack Mountains Formation, in descending order. In the area of the Rock Springs Uplift, includes Al- mond Formation, Ericson Sandstone, Rock Springs Formation, and Blair Formation, in descending order. [Exposed in the eastern Great Divide and Washakie basins and mostly in western Carbon County, where the members of the Mesaverde Group are not mapped separately at this 1:500,000 scale.]

10-9 Kal Upper Cretaceous: sandstone and shale. Almond Formation of the Mesaverde Group (Kal) (Upper Cretaceous) – White and brown soft sandstone, gray sandy shale, coal, and carbonaceous shale (Love and Chris- tiansen, 1985). [Exposed as an encircling outcrop pattern around Rock Springs Uplift.]

Ke Upper Cretaceous: sandstone and conglomerate. Ericson Sandstone of the Mesaverde Group (Ke) (Upper Cretaceous) – White massive sandstone; lenticular chert-grit conglomerate in upper part (Love and Christiansen, 1985). [Exposed as an encircling outcrop pattern around Rock Springs Uplift.]

Kr Upper Cretaceous: sandstone and mudstone. Rock Springs Formation of the Mesaverde Group (Kr) (Upper Cretaceous) – White to brown sandstone, shale, and claystone; numerous coal beds (Love and Christiansen, 1985). [Exposed as an encircling outcrop pattern around Rock Springs Uplift.]

Kbl Upper Cretaceous: sandstone and shale. Blair Formation of the Mesaverde Group (Kbl) (Upper Cretaceous) – Drab-yellow and brown sandstone and sandy shale (Love and Christiansen, 1985). [Exposed as an encircling outcrop pattern around Rock Springs Uplift.]

Kav Upper Cretaceous: sandstone and fine-grained mixed clastic. Adaville Formation (Kav) (Upper Cretaceous) – Gray sandstone, siltstone, and carbonaceous claystone; conglomeratic in upper part; coal-bearing in lower part (Love and Christiansen, 1985). [Exposed in the eastern Overthrust Belt and western Green River Basin, mostly in Uinta and Lincoln counties and in a few outcrop areas in southwestern Sublette County.]

Ksb Upper Cretaceous: sandstone and coal. Sohare Formation and Bacon Ridge Sandstone (Ksb) (Upper Cretaceous) [Exposed only in two small outcrop areas in northern Green River Basin and near Pinedale in north- central Sublette County.] Sohare Formation – Lenticular gray and brown sandstone and shale; thin coal beds (Love and Christiansen, 1985). Bacon Ridge Sandstone – Gray to tan marine sandstone and thick coal beds; gold-bearing quartzite conglomerate in lower part (Love and Christiansen, 1985).

Kh Upper Cretaceous: mudstone. Hilliard Shale (Kh) (Upper Cretaceous) – Dark gray to tan claystone, siltstone, and sandy shale (Love and Christiansen, 1985). [Exposed in the eastern Overthrust Belt, mostly in Uinta and Lincoln counties.]

Kbb Upper Cretaceous: medium-grained mixed clastic and fine-grained mixed clastic. Blind Bull Formation (Kbb) (Upper Cretaceous) – Gray to tan conglomeratic sandstone, siltstone, claystone, coal, and bentonite (Love and Christiansen, 1985). [Exposed in the eastern part of northern Overthrust Belt, northeastern Lincoln County and western Sublette County.]

10-10 Kba Upper Cretaceous: shale and sandstone. Baxter Shale (Kba) (Upper Cretaceous) – Gray to black soft sandy shale and shaly sandstone (Love and Christiansen, 1985). [The Baxter Shale is the oldest rock formation exposed at the ground surface in the central core area (Baxter Basin) of Rock Springs Uplift.]

Kc Upper Cretaceous: shale and siltstone. Cody Shale (Kc) (Upper Cretaceous, ~78-83 Ma) – Dull-gray shale, gray siltstone, and fine-grained gray sandstone (Love and Christiansen, 1985). [Exposed as only a few outcrops in northern Green River Basin in northern Sublette County and a few outcrops in northeastern Great Divide Basin, mostly in Carbon County.]

Ksn Upper Cretaceous: shale and mixed clastic/volcanic. Steele Shale and Niobrara Formation (Ksn) (Upper Cretaceous) – [Exposed as only a few outcrops in eastern Great Divide Basin, mostly in Carbon County. Mapped as a combined unit at this 1:500,000 scale.] Steele Shale (Ksn) (~78-82 Ma) – Gray soft marine shale containing numerous bentonite beds and thin lenticular sandstone and overlies the Niobrara Forma- tion (Love and Christiansen, 1985). Niobrara Formation (Ksn) (~83 Ma) – Light-colored limestone and gray to yellow speckled limy shale and underlies the Steele Shale (Love and Christiansen, 1985).

Ks Upper Cretaceous: shale and mixed clastic/volcanic. Steele Shale (Ks) (Upper Cretaceous, ~78-82 Ma) – Gray soft marine shale containing numerous bentonite beds and thin lenticular sandstone (Love and Christiansen, 1985). [Exposed in eastern Washakie Basin and northern Rawlins Uplift area in western Carbon County.]

Kn Upper Cretaceous: limestone and fine-grained mixed clastic. Niobrara Formation (Kn) (Upper Cretaceous, ~83 Ma) – Light-colored limestone and gray to yellow speckled limy shale (Love and Christiansen, 1985). [Exposed only in a few outcrops in eastern Washakie Basin and northern Rawlins Uplift area in western Carbon County.]

Kf Upper Cretaceous: sandstone and shale. Frontier Formation (Kf) (Upper Cretaceous) – White to brown sandstone and dark gray shale; oyster coquina in upper part; coal and lignite in lower part (Love and Christians- en, 1985). [Exposed in eastern Overthrust Belt and in a few outcrops in northern Green River Basin.] In southern Wyoming, the Frontier Formation consists of gray sandstone and sandy shale (Love and Christiansen, 1985). [Exposed in northern Rawlins Uplift area and in a few outcrops on western flank of Sierra Madre. The Frontier Formation underlies most of the Wyoming Green River Basin.]

10-11 Kft Upper and Lower Cretaceous: sandstone and shale. Frontier Formation, Mowry Shale, and Thermopolis Shale (Kft) (Lower and Upper Cre- taceous) [Exposed only in a few outcrops in northern Green River Basin and also along the western flanks of the Sierra Madre and Rawlins Uplift.] Frontier Formation – Gray sandstone and sandy shale (Love and Christiansen, 1985). Mowry Shale (Upper Cretaceous) – Silvery-gray hard siliceous shale containing abundant fish scales and bentonite beds (Love and Christiansen, 1985). Thermopolis Shale (Lower Cretaceous) – Black soft fissile shale;Muddy Sand- stone Member at top (Love and Christiansen, 1985).

Lower Cretaceous geologic units, Wyoming

Kss Lower Cretaceous: mudstone and sandstone. Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations (Kss) (Lower Cretaceous) – [These formations are located in western Overthrust Belt in Wyoming. Stratigraphic equivalents of the Bear River Formation and Aspen Shale in the eastern Overthrust Belt and western Green River Basin. Exposed only in a few small outcrops in Overthrust Belt in Uinta and Lincoln counties.] Sage Junction Formation (uppermost unit of the five) – Gray and tan siltstone and sandstone (Love and Christiansen, 1985). Quealy Formation – Variegated mudstone and tan sandstone (Love and Chris- tiansen, 1985). Cokeville Formation – Tan sandstone, claystone, limestone, bentonite, and coal (Love and Christiansen, 1985). Thomas Fork Formation – Variegated mudstone and gray sandstone (Love and Christiansen, 1985). Smiths Formation (basal unit of the five) – Ferruginous black shale and tan to brown sandstone (Love and Christiansen, 1985).

Ka Lower Cretaceous: mudstone and mixed clastic/volcanic. Aspen Shale (Ka) (Lower Cretaceous) – Light- to dark-gray siliceous tuffaceous shale and siltstone, thin bentonite beds, and quartzitic sandstone (Love and Christiansen, 1985). [Exposed along eastern Overthrust Belt in Uinta, Lincoln, and Sublette counties. Aspen Shale is considered Lower Cretaceous, but is considered stratigraphically equivalent to the Upper Cretaceous Mowry Shale in the area east of the Overthrust Belt and across Wyoming.]

Kbr Lower Cretaceous: shale and sandstone. Bear River Formation (Kbr) (Lower Cretaceous) – Black shale, fine-grained brown sandstone, thin limestone, and bentonite beds (Love and Christiansen, 1985). [Exposed along eastern Overthrust Belt in Uinta, Lincoln, and Sublette counties.] Kmt Lower Cretaceous: shale and sandstone. Mowry and Thermopolis Shales (Kmt) (Lower and Upper Cretaceous) – [Exposed only in a few small outcrops in northern Green River Basin and northern Rawlins Uplift area.] Mowry Shale (Upper Cretaceous) – Silvery-gray hard siliceous shale containing abundant fish scales and bentonite beds (Love and Christiansen, 1985). Thermopolis Shale (Lower Cretaceous) – Black soft fissile shale withMuddy Sandstone Member at top (Love and Christiansen, 1985).

10-12 Kg Lower Cretaceous: mudstone and sandstone. Gannett Group (Kg) (Lower Cretaceous) – Red sandy mudstone, sandstone, and chert-pebble conglomerate; thin limestone and dark-gray shale in upper part, more conglomeratic in lower part (Love and Christiansen, 1985). Includes Smoot Forma- tion (red mudstone and siltstone), Draney Limestone, Bechler Conglomerate, Peterson Limestone, and Ephraim Conglomerate, in descending order (Love and Christiansen, 1985). Upper Jurassic fossils reported from the basal Ephraim Conglomerate (Love and Christiansen, 1985). [Exposed along eastern Overthrust Belt in Uinta, Lincoln, and Sublette counties; thickens to the north and west within Wyoming Overthrust Belt area and into southeastern Idaho.]

Jurassic geologic units, Wyoming

KJ Upper Jurassic-Lower Cretaceous: sandstone and claystone. Cloverly and Morrison Formations (KJ) (Jurassic to Lower Cretaceous) – [Exposed only in a few small outcrops in northern Green River Basin and along western flank of Sierra Madre.] Cloverly Formation – Rusty sandstone at top, underlain by brightly variegated bentonitic claystone; chert-pebble conglomerate locally at base (Love and Christiansen, 1985). Morrison Formation – Dull variegated siliceous claystone, nodular white limestone, and gray silty sandstone (Love and Christiansen, 1985).

KJs Middle Jurassic-Lower Cretaceous: fine-grained mixed clastic and medium-grained mixed clastic. Cloverly, Morrison, and Sundance Formations (KJs) (Jurassic to Lower Cretaceous) – [Exposed only in a few small outcrops on western flank of Sierra Madre and northern Rawlins Uplift area.] Cloverly Formation – Rusty sandstone at top, underlain by brightly variegated bentonitic claystone; chert-pebble conglomerate locally at base (Love and Christiansen, 1985). Morrison Formation – Dull variegated siliceous claystone, nodular white limestone, and gray silty sandstone (Love and Christiansen, 1985). Sundance Formation – Greenish-gray glauconitic sandstone and shale, underlain by red and gray nonglauconitic sandstone and shale (Love and Chris- tiansen, 1985). Includes wedge edge of Nugget Sandstone in T34N, R88W and T32N, R91W (Love and Christiansen, 1985).

KJg Middle Jurassic-Lower Cretaceous: fine-grained mixed clastic and medium-grained mixed clastic. Cloverly, Morrison, Sundance, and Gypsum Spring Formations (KJg) (Jurassic to Lower Cretaceous) – [Exposed only in a couple of small outcrops in northern Green River Basin and northern Wind River Range in northern Sublette County.] Cloverly Formation – Rusty sandstone at top, underlain by brightly variegated bentonitic claystone; chert-pebble conglomerate locally at base (Love and Christiansen, 1985). Morrison Formation – Dull variegated siliceous claystone, nodular white limestone, and gray silty sandstone (Love and Christiansen, 1985). Sundance Formation – Greenish-gray glauconitic sandstone and shale, underlain by red and gray nonglauconitic sandstone and shale (Love and Christians- en, 1985).

10-13 Gypsum Spring Formation – Interbedded red shale, dolomite, and gypsum; includes a wedge edge of Nugget Sandstone in T34N, R88W and T32N, R91W (Love and Christiansen, 1985).

Jsg Middle Jurassic-Upper Jurassic: sandstone and shale. Sundance and Gypsum Spring Formations (Jsg) (Jurassic) – [Exposed only in a couple of small outcrops in northern Green River Basin and northern Wind River Range in northern Sublette County.] Sundance Formation – Greenish-gray glauconitic sandstone and shale, underlain by red and gray nonglauconitic sandstone and shale (Love and Christians- en, 1985). Gypsum Spring Formation – Interbedded red shale, dolomite, and gypsum (Love and Christiansen, 1985).

J!n Triassic(?)-Jurassic: sandstone. Nugget Sandstone (J!n) (Triassic(?) to Jurassic) – Overthrust Belt – Buff to pink crossbedded, well-sorted quartz sandstone and quartzite; locally has oil and copper-silver-zinc mineralization (Love and Christiansen, 1985). [Exposed in eastern Overthrust Belt and in northernmost Green River Basin.] Also see MzPz, page 10-16.

J!nd Lower Triassic-Jurassic: siltstone and sandstone. Nugget Sandstone, Ankareh Formation, Thaynes Limestone, Woodside Shale, and Din- woody Formation (J!nd) (Triassic to Jurassic) – [Exposed only in a few small outcrops in northernmost Green River Basin Thrust Belt area in northern Sublette County] Nugget Sandstone – Buff to pink crossbedded, well sorted quartz sandstone and quartzite; locally has oil and copper-silver-zinc mineralization (Love and Christiansen, 1985). Ankareh Formation – Red and maroon shale and purple limestone (Love and Christiansen, 1985). Thaynes Limestone – Gray limestone and limy siltstone (Love and Christians- en, 1985). Woodside Shale – Red siltstone and shale (Love and Christiansen, 1985). Dinwoody Formation – Gray to olive-drab dolomitic siltstone (Love and Chris- tiansen, 1985). Nugget Sandstone and Chugwater and Dinwoody Formations (J!nd) (Permian to Tri- assic to Jurassic) – [Exposed only in a few small outcrops in northernmost Green River Basin in northern Sublette County.] Nugget Sandstone – Gray to dull-red crossbedded quartz sandstone (Love and Christiansen, 1985). Chugwater Formation – Red siltstone and shale. Alcova Limestone Member in upper middle part in north Wyoming. Thin gypsum partings near base in north and northeast Wyoming (Love and Christiansen, 1985). Dinwoody Formation – Olive-drab hard dolomitic thin-bedded siltstone (Love and Christiansen, 1985).

10-14 Jst Middle Jurassic-Upper Jurassic: fine-grained mixed clastic and limestone. Stump Formation, Preuss Sandstone or Redbeds, and Twin Creek Limestone (Jst) (Jurassic) [Located in eastern Overthrust Belt, from central to north, in Lincoln and Sublette counties.] Stump Formation – Glauconitic siltstone, sandstone, and limestone (Love and Christiansen, 1985). Preuss Sandstone or Preuss Redbeds – Purple, maroon, and reddish-gray sandy siltstone and claystone; contains salt and gypsum in thick beds in some subsurface sections (Love and Christiansen, 1985). Twin Creek Limestone – Greenish-gray shaly limestone and limy siltstone; includes Gypsum Spring Member (Love and Christiansen, 1985).

Triassic geologic units, Wyoming

!ad Lower Triassic-Upper Triassic: mixed clastic/carbonate and fine-grained mixed clastic. Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation (J!ad) (Triassic) – [Located in eastern Overthrust Belt, from central to north, in Lin- coln and Sublette counties.] Ankareh Formation – Red and maroon shale and purple limestone (Love and Christiansen, 1985). Thaynes Limestone – Gray limestone and limy siltstone (Love and Christians- en, 1985). Woodside Shale – Red siltstone and shale (Love and Christiansen, 1985). Dinwoody Formation – Gray to olive-drab dolomitic siltstone (Love and Chris- tiansen, 1985).

!c Lower Triassic-Upper Triassic: siltstone and shale. Chugwater Formation (!c) (Triassic) – Red siltstone and shale. Alcova Limestone Member in upper middle part of the formation in central Wyoming (Love and Chris- tiansen, 1985). [Exposed on western flank of Sierra Madre, northern Rawlins Uplift, and Great Divide and Washakie basins.] !cd Lower Triassic-Upper Triassic: mudstone and limestone. Chugwater and Dinwoody Formations (!cd) (Triassic) – [Exposed only in a few small outcrops in northern Green River Basin in northern Sublette County.] Chugwater Formation – Red siltstone and shale. Alcova Limestone Member in upper middle part of the formation in central Wyoming; thin gypsum partings near base in northern and northeastern Wyoming (Love and Christiansen, 1985). Dinwoody Formation – Olive-drab hard dolomitic thin-bedded siltstone and green shale (Love and Christiansen, 1985).

10-15 Paleozoic geologic units, Wyoming

MzPz Upper Mississippian-Lower Cretaceous: sedimentary rock units and clastic. Mesozoic and Paleozoic rocks (undivided) (Paleozoic to Mesozoic) – Shown in small areas of complex structure (Love and Christiansen, 1985). [Exposed only in a few small outcrops along western flank of Sierra Madre and northeastern Great Divide Basin (south side Granite Mountains) in western Carbon County.] South side of Granite Mountains: Nugget Sandstone (Triassic (?) to Jurassic – gray to dull red massive to coarsely cross-bedded quartz sandstone (Love and Christiansen, 1985)), Chugwater, and Goose Egg Formations, Tensleep Sandstone, and Amsden Formation (Upper Mississip- pian-Jurassic). West flank of Sierra Madre:Chugwater, Goose Egg, Casper, and Fountain Formations (Middle Pennsylvanian-Upper Triassic).

Pp Permian: shale and phosphorite. Phosphoria Formation (Pp) (Permian) – Upper part dark- to light-gray chert and shale with black shale and phosphorite at top; lower part black shale, phosphorite, and cherty dolomite (Love and Christiansen, 1985). [Located in Overthrust Belt.] Phosphoria Formation and related rocks (Pp) (Permian) – Brown sandstone and dolomite, cherty phosphatic and glauconitic dolomite, phosphatic sandstone and dolomite, and greenish-gray to black shale. Intertonguing equivalents of parts of Phosphoria are Park City Formation (primarily cherty dolomite, limestone, and phosphatic gray shale) and Shedhorn Sandstone (Love and Christiansen, 1985). [Located in eastern Overthrust Belt and northern Green River Basin in Lincoln and Sublette counties.] P$M Upper Mississippian-Permian: limestone and sandstone. Wells and Amsden Formations (P$M) (Upper Mississippian to Permian) – Upper part dark to light gray chert and shale with black shale and phosphorite at top; lower part black shale, phosphorite, and cherty dolomite (Love and Christiansen, 1985). [Exposed in eastern Overthrust Belt and western Green River Basin in Lincoln and Sublette counties.]

PM Upper Mississippian-Permian: sandstone and carbonate. Tensleep Sandstone (PM) (Upper Mississippian to Lower Permian) – Southern Wyo- ming – White to gray sandstone containing thin limestone and dolomite beds (Love and Christiansen, 1985). [Exposed only in a few small outcrops in northern Green River structural basin, northeastern Great Divide Basin, and northern Rawlins Uplift area.] Amsden Formation (PM) (Upper Mississippian to Middle Pennsylvanian) – Southern Wyoming – Red and green shale and dolomite; at base is persistent red to brown sandstone (Love and Christiansen, 1985). [Exposed only in a few small outcrops in northern Green River Basin, northeastern Great Divide Basin, and northern Rawlins Uplift area.]

Pzr Paleozoic: Cambrian-Permian rock units. Madison Limestone and Cambrian rocks (Paleozoic–Cambrian to Mississippian) – Madison Limestone, Darby Formation, Bighorn Dolomite, Gallatin Limestone, Gros Ventre Formation, and Flathead Sandstone (Pzr) (Paleozoic–Middle Cambrian to Mis- sissippian) [Exposed only in a few small outcrops in northeastern Green River Basin]. Madison Limestone – Composed of an upper member of blue-gray massive limestone and dolomite and a lower member of gray cherty limestone and dolomite (Love and Christiansen, 1985). Darby Formation – Yellow and greenish gray shale and dolomitic siltstone underlain by fetid brown dolomite and limestone (Love and Christiansen, 1985).

10-16 Pzr Gallatin Limestone – Gray and tan limestone and blue-gray and yellow mottled hard dense limestone (Love and Christiansen, 1985). Gros Ventre Formation – Greenish gray micaceous shale and soft green micaceous shale (Upper and Middle Cambrian Park Shale Member), underlain by blue-gray and yellow mottled hard dense limestone (Middle Cambrian Death Canyon Limestone Member) and soft green micaceous shale (Middle Cambrian Wolsey Shale Member) (Love and Christiansen, 1985). Flathead Sandstone – Dull red quartzitic sandstone (Love and Christiansen, 1985). Madison Limestone and Cambrian rocks (Pzr) (Paleozoic – Cambrian to Mississip- pian) – [Exposed only in a few small outcrops along western flank of Sierra Madre and northeastern Great Divide Basin in western Carbon County.] Madison Limestone – Composed of upper member of blue-gray massive limestone and dolomite and lower member of gray cherty limestone and dolomite (Love and Christiansen, 1985). Cambrian rocks – Blue-gray and yellow mottled hard dense limestone interbedded with soft green micaceous shale on southern flank of Granite Mountains (Love and Christiansen, 1985). Cambrian rocks – Dull-red quartzitic sandstone at base at Rawlins Uplift area (Love and Christiansen, 1985). Cambrian rocks – Glauconitic quartzitic sandstone located at Rawlins Uplift and south of the Rawlins Uplift (Love and Christiansen, 1985).

Mm Lower Mississippian-Upper Mississippian: limestone and dolomite). Madison Group (Mm) (Mississippian) – Includes Mission Canyon Limestone (upper member) – Blue-gray massive limestone and dolomite (Love and Christiansen, 1985). Lodgepole Limestone (lower member) – Gray cherty limestone and dolomite (Love and Christiansen, 1985). [Exposed only in a few small outcrops in eastern Overthrust Belt in Lincoln County.] Madison Limestone (Mm) (Mississippian) – Includes upper member of blue-gray massive limestone and dolomite and lower member of gray cherty limestone and dolomite (Love and Christiansen, 1985). [Exposed only in a few small outcrops in northern Rawlins Uplift area in Carbon County.] MD Upper Devonian-Upper Mississippian: limestone and dolostone (dolomite). Madison Limestone and Darby Formation (MD) (Devonian to Mississippian) – [Exposed only in a few small outcrops in eastern Overthrust Belt and northern Green River Basin.] Madison Limestone – Composed of upper member of blue-gray massive limestone and dolomite and lower member of gray cherty limestone and dolomite (Love and Christiansen, 1985). Darby Formation – Yellow and greenish-gray shale and dolomitic siltstone underlain by fetid brown dolomite and limestone (Love and Christiansen, 1985).

O^ Middle Cambrian-Upper Ordovician: limestone and dolostone (dolomite). Bighorn Dolomite, Gallatin Limestone, and Gros Ventre Formation (O^) (Upper Cam- brian to Ordovician) – [Exposed only in a few small outcrops in eastern Overthrust Belt and northern Green River Basin.] Bighorn Dolomite (upper unit, Ordovician) – Gray massive cliff-forming siliceous dolomite and locally dolomitic limestone (Love and Christiansen, 1985). Gallatin Limestone (Cambrian) – Gray and tan limestone (Love and Chris- tiansen, 1985). Gros Ventre Formation (basal unit, Cambrian) – Greenish-gray micaceous shale (Love and Christiansen, 1985).

10-17 ^r Middle Cambrian-Upper Cambrian: limestone and sandstone. Cambrian rocks – Dull-red quartzitic sandstone at base of Rawlins Uplift (Love and Christiansen, 1985). Possibly Cambrian Buck Spring Formation(?) or Cambrian Flathead Sandstone(?), or Devonian age Fremont Canyon Sandstone(?) composed of glauconitic quartzitic sandstone at Rawlins Uplift and south of Rawlins Uplift (Love and Christiansen, 1985). [Exposed only in one small outcrop in northern Rawlins Uplift area.]

Precambrian geologic units, Wyoming

Xsv Precambrian: Early Proterozoic: metasedimentary rock and metavolcanic rock. Metasedimentary and metavolcanic rocks (Xsv) (Precambrian – Early Proterozoic) – Granite gneiss, felsic gneiss, amphibolite, and metavolcanic rocks (Love and Christians- en, 1985). [Exposed in Sierra Madre.]

Xlc Precambrian: Early Proterozoic: metasedimentary rock. Metasedimentary rocks – Libby Creek Group (Xlc) (Precambrian – Early Proterozoic) – Pelitic schist, amphibolite schist, quartzite, diamictite, quartz-pebble conglomerate, and marble (Love and Christiansen, 1985). [The Libby Creek Group is younger and overlies the Deep Lake Group. Exposed in Sierra Madre.]

Xdl Precambrian: Early Proterozoic: metasedimentary rock. Metasedimentary rocks – Deep Lake Group (Xdl) (Precambrian – Early Proterozoic) – Quartzite, diamictite, pelitic schist, and quartz-pebble conglomerate (Love and Christiansen, 1985). [The Deep Lake Group is older and is overlain by the Libby Creek Group. Exposed in Sierra Madre.] Xgy Precambrian: Early Proterozoic: granitoid. Granitic rocks of 1,700-Ma Age Group (Xgy) (Precambrian – Early Proterozoic) – [Ex- posed in Sierra Madre.]

Xqd Precambrian: Early Proterozoic: quartz diorite. Quartz diorite (Xqd) (Precambrian – Early Proterozoic, 1,800 Ma) – Encampment River Granodiorite (Xqd) (Love and Christiansen, 1985). [Exposed in Sierra Madre.]

Xm Precambrian: Early Proterozoic: gabbroid. Mafic intrusive rocks (Xm) (Precambrian – Early Proterozoic, 1,800 Ma) – Gabbro of Elkhorn Mountain (Xm) (Love and Christiansen, 1985). [Exposed in Sierra Madre.]

PW Precambrian: Late Archean: plutonic igneous. Mafic intrusive rocks (PW) (Precambrian – Late Archean – Proterozoic) – (Love and Christiansen, 1985). [Exposed in Sierra Madre.]

shear Precambrian: Archean: tectonite in a shear zone. [Shown with a wavy pattern ~ unit on the state map (Love and Christiansen, 1985). Exposed only in two small outcrop areas in northern Wind River Range.]

Wgn Precambrian: Late Archean: granitic gneiss. Granite gneiss (Wgn) (Precambrian – Late Archean, 2,600-3,100+ Ma) – Layered to massive, locally migmatitic; metasedimentary and metavolcanic rocks locally common (Love and Christiansen, 1985). [Exposed in Wind River Range and Sierra Madre.]

10-18 WVsv Precambrian: Middle Archean-Late Archean: metasedimentary rock and metavolcanic rock. Metasedimentary and metavolcanic rocks (WVsv) (Precambrian – Middle Archean to Late Archean, 2,600-3,200+ Ma) – Amphibolite, hornblende gneiss, biotite gneiss, quartzite, iron-formation, metaconglomerate, marble, and pelitic schist; locally preserved textures and structures suggest origin to be sedimentary or volcanic. Older than 2,600 Ma in Sierra Madre, where it is the Late Archean Phantom Lake Metamorphic Suite (Love and Christiansen, 1985). [Exposed in Wind River Range and Sierra Madre.]

Ws Precambrian: Late Archean: metasedimentary rock. Metasedimentary rocks (Ws) (Precambrian – Late Archean, 2,800+ Ma) – Metag- raywacke, pelitic schist, metaconglomerate, graphitic schist, and iron-formation; local meta-andesite (Love and Christiansen, 1985). [Exposed in southern Wind River Range.]

Wg Precambrian: Late Archean: granitoid. Granitic rocks of 2,600-Ma Age Group (Wg) (Precambrian – Late Archean, 2,600 Ma) Granitic rocks (Wg) (Precambrian – Late Archean) – Granite (Love and Chris- tiansen, 1985). [Exposed only in a few small outcrops in Granite Mountains area.] Granitic rocks (Wg) (Precambrian – Late Archean) – Granodiorite to por- phyritic and equigranular granite (Love and Christiansen, 1985). [Exposed in Wind River Range.] Granitic rocks (Wg) (Precambrian – Late Archean) – Granite and granodiorite (Love and Christiansen, 1985). [Exposed only in a few outcrops in Sierra Madre.] Wgd Precambrian: Late Archean: granodiorite. Granodiorite of the Louis Lake Pluton (Wgd) (Precambrian – Late Archean, 2,640 Ma) – Equigranular; locally gneissic (Love and Christiansen, 1985). [Exposed only in southern Wind River Range.]

WVg Precambrian: Middle Archean-Late Archean: granitoid. Plutonic rocks (WVg) (Precambrian – Middle Archean to Late Archean) – Wind River Range – Largely granite gneiss; contains diorite and quartz diorite facies (Love and Christiansen, 1985). [Exposed only in northern Wind River Range.]

Ugn Precambrian: Early Archean: granite gneiss and migmatite. Oldest gneiss complex (Ugn) (Precambrian – Early Archean) – Chiefly layered granitic gneiss, locally migmatitic. Local masses of quartzite, metagraywacke, iron-formation, and other metasedimentary rocks and amphibolite and felsic gneiss thought to be volcanic. Includes large bodies of metagabbro. Inclusions show evidence of granulite-facies metamorphism prior to 2,800 Ma (Love and Christiansen, 1985). [Located in northern Wind River Range. The Early Archean gneiss complex contains the oldest rocks in Wyoming.]

Ugn+ Precambrian: Early Archean: granite gneiss and migmatite. Oldest gneiss complex (Precambrian – Early Archean) – Area of migmatite related to emplacement of 2,600-Ma granite (Love and Christiansen, 1985). These are the oldest rocks in Wyoming. [Located in northern Wind River Range. Shown with an overprint pattern (+) in the Ugn unit on the state map (Love and Christiansen, 1985).]

10-19 greater Green River Basin geologic units – Colorado There are 40 digital GIS geologic units in the Colorado portion of the Greater Green River Basin, including surface water. The following lithologic descriptions are taken directly from Tweto (1976) and Luft (1985) with minor modifications.

References Bradley, W.H., 1961, Geologic map of a part of southwestern Wyoming and adjacent states: U.S. Geo- logical Survey Miscellaneous Geologic Investigations Map I-332, scale 1:250,000.

Luft, S.J., 1985, Generalized geologic map showing distribution and basal configuration of the Browns Park Formation and Bishop Conglomerate in northwestern Colorado, northeastern Utah, and southern Wyoming: U.S. Geological Survey Miscellaneous Field Studies Map MF-1821, scale 1:250,000.

Stoeser, D.B., Green, G.N., Morath, L.C., Heran, W.D., Wilson, A.B., Moore, D.W., Van Gosen, B.S., 2005, Preliminary Integrated Geologic Map Databases for the United States central states: Montana, Wyoming, Colorado, New Mexico, Kansas, Oklahoma, Texas, Missouri, Arkansas, and Louisiana: U.S. Geological Survey, Open-File Report 2005-1351, digital data. [Includes both Wyoming and Colorado at 1:500,000-scale, though different states within this database have different scales.]

Tweto, Ogden, compiler, 1976, Geologic map of the Craig 1° × 2° quadrangle, northwestern Colorado: U.S. Geological Survey Miscellaneous Investigations Series Map I-972, scale 1:250,000.

Unit symbol Unit description

Cenozoic geologic units, Colorado Quaternary geologic units, Colorado

Water Water [surface water]

Qa Quaternary alluvium. Modern alluvium – Includes Piney Creek alluvium and younger deposits (Stoeser et al., 2005). Alluvium (Qa) (Holocene) – Unconsolidated gravel, sand, silt, and clay in stream valleys and alluvial fans (Tweto, 1976).

Ql Quaternary landslide and talus deposits. Landslide deposits – Locally includes talus, rock-glacier, and thick colluvial deposits (Stoeser et al., 2005). Landslide deposits (Ql) (Pleistocene-Holocene) – Shaly material with or without boulders of sandstone and basalt. Extensive areas of landslides in the Elkhead Moun- tains, which are located in north-central Craig quadrangle and east of Sand Wash Basin (Tweto, 1976) are not shown on the Stoeser et al. (2005) digital map.

Qe Quaternary dune sand and silt. Eolian deposits – Includes dune sand and silt and Peoria loess (Stoeser et al., 2005). Eolian deposits (Qe) (Holocene) – Unconsolidated wind-blown sand and silt (Tweto, 1976).

10-20 Qg Quaternary gravel and alluvium. Gravels and alluvium (Pinedale and Bull Lake age) – Includes Broadway and Louviers alluviums (Stoeser et al., 2005). Young gravels (Bull Lake age and younger) (Qg) (Pleistocene) – Unconsolidated stream, terrace, and outwash gravels (Tweto, 1976). Young glacial drift (Bull Lake age and younger) (Qd) (Pleistocene) – Unconsolidated and unsorted boulder glacial deposits (till) and associated sand and gravel deposits (Tweto, 1976).

Qdo Quaternary glacial drift deposits. Older glacial drift (pre-Bull Lake age) (Stoeser et al., 2005). Older glacial drift (pre-Bull Lake age) (Qdo) (Pleistocene) – Unconsolidated and unsorted boulder glacial deposits (till) and associated gravels (Tweto, 1976).

Qgo Quaternary gravel and alluvium (older?). Older gravels and alluviums (pre-Bull Lake age) – Includes Slocum, Verdos, Rocky Flats, and Nussbaum alluviums in east, and Florida, Bridgetimber, and Bayfield gravels in southwest (Stoeser et al., 2005). Older gravels (pre-Bull Lake age) (Qgo) (unconsolidated Pleistocene) – Terrace, outwash, alluvial-fan, and pediment gravels (Tweto, 1976).

Upper Tertiary geologic units, Colorado

Tui Tertiary: plutonic igneous unit. Upper Tertiary intrusive rocks (<20 Ma) – Intermediate to felsic compositions (Stoeser et al., 2005). Upper Tertiary intrusive rocks (Tui) (Miocene-Pliocene, <20 Ma) – Mainly porphyries of intermediate and basaltic compositions. Located in Elkhead Mountains in north- central Craig quadrangle; east of Sand Wash Basin (Tweto, 1976).

Tbp Tertiary: sandstone and siltstone. Browns Park Formation (Tbp) (Miocene) – Fluvial sandstone, claystone, and conglomerate, loosely consolidated eolian sandstone, and volcanic ash; boulder conglomerate in places; conglomerate at base; maximum thickness ~2,000 ft (Tweto, 1976). [Located west of the Park Range.]

Tv Tertiary: intermediate volcanic rock unit. Volcanic rocks in northwestern Colorado (<7-33 Ma) – Mainly intermediate compositions (Stoeser et al., 2005). Volcanic rocks (Tv) (Oligocene-Pliocene, <7-33 Ma) – Principally intermediate compositions; includes some basalt, light-colored tuffs, and boulder-size volcanic breccia (Tweto, 1976).

10-21 Lower Tertiary geologic units, Colorado

Tos Tertiary: sandstone and shale. Oligocene sedimentary rocks – Includes Duchesne River Formation (sandstone and shale; includes some Eocene rocks) and Oligocene Bishop Conglomerate near Colora- do-Utah border (Stoeser et al., 2005).

Tb Tertiary: mudstone and claystone. Bridger Formation – Claystone and mudstone in Sand Wash Basin (Stoeser et al., 2005). Bridger Formation (Eocene) – Greenish-gray, olive-drab, and white tuffaceous sandstone and claystone; lenticular marlstone and conglomerate in Tb unit in southwest Wyoming (Love and Christiansen, 1985).

Tglm Tertiary: claystone and oil shale. Laney Member of the Green River Formation (Eocene) – Claystone, oil shale, and sandstone in Sand Wash Basin (Stoeser et al., 2005).

Tgt Tertiary: claystone and oil shale. Tipton Tongue of the Green River Formation – Claystone and oil shale in Sand Wash Basin and in extreme northwest Colorado; includes rocks of Wilkins Peak Member of the Green River Formation (Stoeser et al., 2005). Tipton Tongue of the Green River Formation (Tgt) (Eocene) – Brown to gray lacustrine sandstone and papery carbonaceous shale. Thickness from less than 50 to 300 ft (Tweto, 1976).

Tglu Tertiary: shale and mudstone. Luman Tongue of the Green River Formation (Eocene) – Carbonaceous shale and marlstone in Sand Wash Basin (Stoeser et al., 2005).

Twc Tertiary: claystone and mudstone. Cathedral Bluffs Tongue of the Wasatch Formation – Claystone, mudstone, and sandstone in Sand Wash Basin (Stoeser et al., 2005). Cathedral Bluffs Tongue of the Wasatch Formation (Twc) (Eocene) – Variegated fluvial claystone, mudstone, and sandstone. Thickness 1,000-1,500 ft (Tweto, 1976).

Twn Tertiary: mudstone and sandstone. Niland Tongue of the Wasatch Formation (Eocene) – Mudstone, sandstone, and carbonaceous shale in Sand Wash Basin (Stoeser et al., 2005).

Tw Tertiary: claystone and shale. Wasatch Formation – Claystone, shale, and sandstone (Stoeser et al., 2005). Main body of the Wasatch Formation (Tw) (Eocene) – Gray and pink fluvial arkosic sandstone, mudstone, and conglomerate. Maximum thickness ~5,000 ft (Tweto, 1976). Tf Tertiary: shale and sandstone. Fort Union Formation – Shale, sandstone, and local coal beds (Stoeser et al., 2005). [Equivalent to Tfu unit in Wyoming.] Fort Union Formation (Tf) (Paleocene) – Drab, brown, and gray sandstone and shale; contains coal beds. Thickness ~1,500 ft (Tweto, 1976).

10-22 Mesozoic geologic units, Colorado Upper Cretaceous geologic units, Colorado

Kl Cretaceous: shale and claystone. Lance Formation – Shale, sandstone, and minor coal beds; Fox Hills Sandstone equivalent is located at the base of the formation (Stoeser et al., 2005). Lance Formation (Kl) (Upper Cretaceous) – Gray shale, light-brown sandstone, and a few coal beds. Thickness 1,000-1,500 ft (Tweto, 1976).

Kls Cretaceous: shale. Lewis Shale (Stoeser et al., 2005) [equivalent to Kle unit in Wyoming]. Lewis Shale (Kls) (Upper Cretaceous) – Dark-gray homogeneous marine shale. Thick- ness 1,500-1,900 ft (Tweto, 1976).

Kmv Cretaceous: sandstone and shale. Mesaverde Formation – Undivided – Major coal beds in lower part and sandstone at base (Stoeser et al., 2005). Mesaverde Group – Undivided (Kmv) (Upper Cretaceous) Williams Fork Formation (Kw) (Upper Cretaceous) – Light brown to white sandstone, gray shale, and coal beds. Thickness 1,100-2,000 ft (Tweto, 1976). Iles Formation (Ki on Tweto’s (1976) map) (Upper Cretaceous) – Massive beds of light brown to white sandstone and interbedded gray shale and coal. Thick- ness 1,500 ft (Tweto, 1976).

Kw Cretaceous: sandstone and shale. Williams Fork Formation – Sandstone, shale, and major coal beds (Stoeser et al., 2005). Williams Fork Formation (Kw) (Upper Cretaceous) – Light-brown to white sandstone, gray shale, and coal beds. Thickness 1,100-2,000 ft (Tweto, 1976). Iles Formation (Ki on Tweto’s (1976) map) (Upper Cretaceous) – Massive beds of light-brown to white sandstone and interbedded gray shale and coal. Thick- ness 1,500 ft (Tweto, 1976).

Km Cretaceous: shale and sandstone. Mancos Shale – Intertongues complexly with units of overlying Mesaverde Group or Formation; lower part consists of a calcareous Niobrara Formation equivalent and Frontier Sandstone and Mowry Shale members. In areas where Frontier and Mowry Members (Kmfm on Tweto’s (1976) map) or these two and Dakota Sandstone (Kfd on Tweto’s (1976) map) are distinguished, map unit (Km) consists of shale above Frontier Member (Stoeser et al., 2005). Mancos Shale (Km) (Upper and Lower Cretaceous) – Gray to dark-gray marine shale. Sandstone beds near top; calcareous sandstone of Upper Cretaceous Frontier Member 300–400 ft above base, overlain by calcareous shale zone equivalent to Niobrara Forma- tion; silver-gray siliceous shale of Lower Cretaceous Mowry Shale Member at base. Thickness ~5,000 ft (Tweto, 1976).

10-23 Kfd Cretaceous: sandstone and shale. Frontier Sandstone and Mowry Shale Members of Mancos Shale and Dakota Sand- stone – Locally includes, at base, Burro Canyon Formation (shale and sandstone) or, in western Moffat County,Cedar Mountain Formation (conglomerate and shale) (Stoeser et al., 2005). Frontier Sandstone and Mowry Shale Members and intervening shale (Kmfm on Twe- to’s (1976) map) (Upper and Lower Cretaceous) – Distinguished only locally on west side of Park Range. On east side of Park Range, equivalent units are in Benton Shale of Colorado Group. Thickness ~500 ft (Tweto, 1976).

Lower Cretaceous geologic units, Colorado

KJds Cretaceous-Jurassic: sandstone and mudstone. Dakota, Morrison, and Sundance Formations (Stoeser et al., 2005). Dakota Sandstone (Kd on Tweto’s (1976) map) (Lower Cretaceous) – Light gray and tan sandstone or quartzite; some interbedded dark shale and shaly sandstone. Thickness 100–250 ft. Resistant, widely exposed unit but too thin to show separately on Tweto’s 1:250,000-scale map in many areas (Tweto, 1976). Morrison Formation (Jm) (Upper Jurassic) – Variegated shale and mudstone, light-gray sandstone, and beds of fine-grained gray limestone; locally conglomeratic near base. Thickness ~300-500 ft (Tweto, 1976). Sundance Formation (Jm) (Upper Jurassic) – Yellowish gray to pale green glauconitic and oolitic marine limestone and sandstone and crossbedded light gray to orange sandstone containing local intervening red and yellow siltstone beds. Thickness 100-300 ft (Tweto, 1976).

Jurassic geologic units, Colorado

Jm Jurassic: mudstone and sandstone. Morrison Formation – Variegated claystone, mudstone, sandstone, and local beds of limestone (Stoeser et al., 2005). Morrison Formation (Jm) (Upper Jurassic) – Variegated shale and mudstone, light-gray sandstone, and beds of fine-grained gray limestone; locally conglomeratic near base. Thickness ~300-500 ft (Tweto, 1976).

J!mg Jurassic-Triassic: mudstone and sandstone. Morrison, Curtis, Entrada, and Glen Canyon Formations – Curtis Formation is absent along Grand Hogback in western Colorado (Stoeser et al., 2005). Morrison Formation (Jm) (Upper Jurassic) – Variegated shale and mudstone, light-gray sandstone, and beds of fine-grained gray limestone; locally conglomeratic near base. Thickness ~300-500 ft (Tweto, 1976). Curtis Formation (Upper Jurassic) – Yellowish-gray to pale-green glauconitic and oolitic marine limestone and sandstone. Sundance Formation is equivalent east of Park Range. Thickness less than 100 ft; wedges to zero thickness locally in Park Range (Tweto, 1976). Sundance Formation (Upper Jurassic) – Yellowish-gray to pale-green glauconitic and oolitic marine limestone and sandstone and crossbedded light-gray to orange sandstone containing local intervening red and yellow siltstone beds. Thickness 100-300 ft (Tweto, 1976).

10-24 Entrada Sandstone (Upper Jurassic) – Crossbedded light-gray to orange sandstone. Sundance Formation is equivalent east of Park Range. Thickness generally 75-175 ft, but wedges out to zero thickness locally in Park Range (Tweto, 1976). Glen Canyon Sandstone [or Navajo Sandstone] (Lower Jurassic and Upper Triassic) – Crossbedded light-brown to light-gray sandstone that closely re- sembles the overlying Entrada Sandstone, from which it is separated by a subtle unconformity. Maximum thickness ~100 ft (Tweto, 1976).

Triassic geologic units, Colorado

!Pcp Triassic-Permian: siltstone and shale. Chinle, Moenkopi, and Park City Formations – Red and gray siltstone, shale, and sandstone (Stoeser et al., 2005). Chinle Formation (!c on Tweto’s (1976) map) (Upper Triassic) – Brownish- and purplish-red, calcareous siltstone, mudstone, and sandstone; limestone- pellet conglomerate in lower part; Gartra Sandstone Member present at base locally (grayish-purple to white coarse-grained sandstone and conglomeratic sandstone 25 ft thick). Thickness 600 ft in the west part of the Craig quadrangle; thins eastward beneath pre-Entrada unconformity to zero thickness locally in the Park Range. Equivalent strata near Wyoming-Colorado border and northward into Wyoming are Popo Agie and Jelm Formations (Tweto, 1976). Bell Springs Member of Nugget Sandstone (Upper Triassic(?)) – Reddish- brown sandstone and siltstone. Thickness ~50 ft (Tweto, 1976). Popo Agie Formation (Upper Triassic) – Purplish-red siltstone, sandstone, and claystone. Thickness ~120 ft in Chugwater Group (Tweto, 1976). Jelm Formation (Upper Triassic) – Grayish-red to purple fine-grained micaceous sandstone. Thickness ~100 ft in Chugwater Group (Tweto, 1976). Red Peak Formation (Lower Triassic) – Red calcareous siltstone and fine- grained sandstone. Thickness about <100 ft in Chugwater Group (Tweto, 1976). Chugwater Formation (Triassic) – Red and gray sandstone, siltstone, shale, and conglomerate. Thickness in the northern North Park is 800 ft; thins to zero thickness southward in Park Range (Tweto, 1976).

!Pr Triassic-Permian: siltstone and shale. Triassic and Permian Rocks – Red siltstone, shale, and sandstone. Includes various combinations of Nugget, Jelm, Popo Agie, Chugwater, Red Peak, Forelle, Satanka, and Goose Egg Formations near Wyoming-Colorado border (Stoeser et al., 2005). Chinle and Chugwater Formations (!r on Tweto’s (1976) map) (Triassic) – On west flank of Park Range (Tweto, 1976). Goose Egg Formation (Lower Triassic and Permian) – Thin red siltstone and gray limestone near base are the only lithologies present in Craig quadrangle (Tweto, 1976). Forelle Limestone Member of Goose Egg Formation (Permian) – Gray limestone. Thickness <20 ft (Tweto, 1976). State Bridge Formation (Lower Triassic and Permian) – Orange-red and red-brown siltstone and sandstone. Maximum thickness 500 ft; thins to zero thickness in many places along Park Range. In Meeker area, Colorado, assigned by some geologists to Moenkopi (Lower Triassic) and Park City (Permian) Formations (Tweto, 1976).

10-25 Satanka Shale (Permian) – Red shale. Maximum thickness 135 ft (Tweto, 1976). Bell Springs Member of Nugget Sandstone, Popo Agie, and Jelm Formations, and remnants of Red Peak Formation on west side of Park Range near Wyo- ming-Colorado border (!Pr) (Permian and Triassic) (Tweto, 1976).

Paleozoic geologic units, Colorado

P$w Permian-Pennsylvanian: sandstone. Weber Sandstone (Stoeser et al., 2005). Weber Sandstone and Maroon Formation (P$wm on Tweto’s (1976) map) (Stoeser et al., 2005). Weber Sandstone (P$wm on Tweto’s (1976) map) (Permian and Pennsylva- nian) – Yellow-gray sandstone. Thickness ~100 ft (Tweto, 1976). Maroon Formation (P$wm on Tweto’s (1976) map) (Pennsylvanian) – Gray and pastel-colored sandstone, grit, conglomerate, and shale; intertongues with gypsum of Eagle Valley Evaporite; thickness in the west greater than 1,000 ft; and thins eastward by onlap to zero thickness in Park Range (Tweto, 1976).

$mr Pennsylvanian: limestone and sandstone. Morgan Formation (limestone, sandstone, and shale) and Round Valley Limestone – Located in far northwestern Colorado (Stoeser et al., 2005). Minturn Formation or Morgan Formation in western Craig quadrangle ($m) (Pennsylvanian) – Gray and pastel-colored sandstone, grit, conglomerate, and shale; intertongues with gypsum of Eagle Valley Evaporite. Thickness in the western Craig quadrangle greater than 1,000 ft; thins eastward by onlap to zero thickness in Park Range (Tweto, 1976). Eagle Valley Evaporite ($e on Tweto’s (1976) map) (Pennsylvanian) – Gypsum or anhydrite and interbedded gray shale, siltstone, and thin carbonate beds. Thickness uncertain owing both to diapiric movements and to evaporite mineral dissolution (Tweto, 1976). [Not in GGRB.]

M^ml Mississippian-Cambrian: limestone and sandstone. Madison Limestone (Mississippian) and Lodore Formation (Cambrian) (Stoeser et al., 2005). Mississippian and Cambrian rocks (M^r on Tweto’s (1976) map) – Located in small area at west edge of Craig quadrangle only. Gray limestone referable either to Leadville Limestone or Madison Limestone (Mississippian), underlain by sandstone, quartzite, and shale referable either to Sawatch Quartzite or to Lodore Formation (Cambrian). Thickness <500 ft (Tweto, 1976). [Not in GGRB.]

Mm Mississippian: limestone and shale. Madison Limestone (Mississippian) – Upper part includes equivalents of Upper Mis- sissippian Doughnut and Humbug Formations (shale, limestone, and sandstone); gray limestone locally present in Uinta Mountains (Stoeser et al., 2005).

10-26 ^l Cambrian: sandstone and shale. Lodore Formation (Cambrian) – Sandstone, shale, and conglomerate (Stoeser et al., 2005). Sawatch Quartzite (^s on Tweto’s (1976) map) (Cambrian) – Remnants less than 100 ft thick (Tweto, 1976). [Not in GGRB.]

Precambrian geologic units, Colorado

Yu Precambrian-Middle Proterozoic: quartzite and conglomerate. Uinta Mountain Group (sedimentary rocks, 950-1,400 Ma) – Quartzite, conglomerate, and shale (Stoeser et al., 2005).

Xfh Precambrian-Early Proterozoic: felsic gneiss and mafic gneiss. Felsic and hornblendic gneisses (either separate or interlayered) (metamorphic rocks, 1,700-1,800 Ma) – Includes metabasalt, metatuff, and interbedded greywacke; locally contains interlayered biotite gneiss. Derived principally from volcanic rocks (Stoeser et al., 2005). Precambrian interlayered felsic and hornblende gneisses (Xfh) – Probably mainly metavolcanic but includes some interlayers of pelitic biotite-sillimanite gneiss and schist and local pods of calc-silicate gneiss (Tweto, 1976).

Xg Precambrian-Early Proterozoic: granite and granodiorite. Granitic rocks of 1,700-Ma age group (igneous rocks, 1,650-1,730 Ma) – Granitic rocks includes Boulder Creek, Cross Creek, Denny Creek, Kroenke, Browns Pass, Pow- derhorn, Pitts Meadow, Bakers Bridge, and Tenmile granites; quartz monzonites; and granodiorites; and unnamed granitic rocks (Stoeser et al., 2005). Precambrian rocks of ~1,700-Ma age group – Granitic rocks (Xg) – Granitic rocks – Quartz monzonite, granodiorite, and quartz diorite compositions; partly migmatic (Tweto, 1976).

Xm Precambrian-Early Proterozoic: gabbro and diorite. Mafic rocks of 1,700-Ma age group (igneous rocks) – Gabbro and mafic diorite and monzonite (Stoeser et al., 2005). Precambrian rocks of ~1,700-Ma age group – Mafic rocks (Xm) – Mafic intrusive rocks – Gabbro, diabase, and dark hornblende diorite (Tweto, 1976). Wr Precambrian-Late Archean: quartzite and amphibolite. Red Creek Quartzite (probably >2,500 Ma) – Metaquartzite, amphibolite, and mica schist; present only in Uinta Mountains (Stoeser et al., 2005

10-27 greater Green River Basin geologic units – Utah There are 25 digital GIS geologic units located in the Utah portion of the Greater Green River Basin, including surface water (Hintze et al., 2000). The following lithologic descriptions are taken directly from Rowley et al. (1985), Bryant (1992), and Hintze et al. (2000) with minor modifications.

References Bryant, B., 1992, Geologic and structure maps of the Salt Lake City 1° x 2° quadrangle, Utah and Wyo- ming: U.S. Geological Survey Miscellaneous Investigations Series Map I-1997, scale 1:250,000, 3 sheets.

Hintze, L.F., 1973, Geologic history of Utah: Brigham Young University, Provo, Utah, BYU Geology Studies, Utah Geologic History, vol. 20, part 3, 181 p.

Hintze, L.F., Willis, G.C., Laes, D.Y.M., Sprinkel, D.A., and Brown, K.D., 2000, Digital geologic map of Utah: Utah Geological Survey, scale 1:500,000.

Rowley, P.D., Hansen, W.R., Tweto, O., and Carrara, P.E., 1985, Geologic map of the Vernal 1° x 2° quadrangle, Colorado, Utah, and Wyoming: U.S. Geological Survey Miscellaneous Investigations Series Map I-1526, scale 1:250,000.

Stokes, W.L., 1986, Geology of Utah: Utah Museum of Natural History, University of Utah, and Utah Geological and Mineral Survey, Department of Natural Resources, Salt Lake City, Utah, Occasional Paper No. 6 of the Utah Museum of Natural History, 280 p.

Cenozoic geologic units, Utah Quaternary geologic units, Utah

Water Water [surface water].

Qa Quaternary: Surficial alluvium and colluvium(Hintze et al., 2000). Alluvium (Qa) (Holocene) – Silt, sand, and gravel in channels and flood plains of major drainages; may be partly of Pleistocene age (Rowley et al., 1985). Alluvium and colluvium (Qac) (Holocene) – Generally massively bedded clay, silt, sand, and gravel in channels and flood plains of mostly small drainages; includes alluvial slope wash and colluvium (Rowley et al., 1985). Fan deposits and colluvium (Qf) (Holocene and Pleistocene) – Poorly sorted silty sand and gravel deposited in alluvial fans and talus cones at the base of steep slopes; includes colluvium on and below steep slopes (Rowley et al., 1985). Alluvium and colluvium (Qac) (Holocene) – Sand, gravel, silt, and clay (Bryant, 1992). Alluvium (Qa) (Holocene) – Boulder to pebble gravel, sand, silt, and clay deposited in channels and flood plains of streams. Thickness as much as 10 ft (Bryant, 1992).

10-28 Qao Quaternary: Surficial older alluvium and colluvium(Hintze et al., 2000). Deposits on pediment surfaces (Qp) (Holocene and Pleistocene) – Poorly sorted silty sand and gravel of pediments and, locally, of broad alluvial fans. Deposits on some pediments are very thin or locally missing (Rowley et al., 1985). River-terrace deposits (Qr) (Pleistocene) – Gravel and subordinate sand and silt that form alluvial remnants on dissected benches along rivers (Rowley et al., 1985). Deposits on older pediment surfaces (Qop) (Pleistocene) – Poorly sorted silty sand and gravel from dissected remnants of pediments and alluvial fans; deposits on some old pediments are thin or locally missing; may include modified river-terrace deposits or older glacial outwash; may include Tertiary age deposits (Rowley et al., 1985). Old gravel deposits (QTg) (Pleistocene) – Unconsolidated to moderately consolidated gravel and sand capping high-level erosion surfaces. May not all be of same age; may locally include Bishop Conglomerate (Tbc) or Browns Park Formation (Tbp). Maximum thickness ~165 ft (Rowley et al., 1985). Old alluvium (Qoa) (Pleistocene) – Gravel, silty gravel, and sandy silt of dissected alluvial fans, alluvium, and local marsh deposits (Bryant, 1992). Pediment deposits (Qp) (Holocene and Pleistocene) – Boulder, cobble, and pebble gravel in a sand and silt matrix (Bryant, 1992). Terrace gravels (Qtg) (Holocene and Pleistocene) – Pebble and cobble gravel, sand, and silt deposited by streams. Terraces located 20 ft to more than 330 ft in elevation above modern flood plain levels. Some deposits may be glacial outwash (Bryant, 1992). Gravel (QTg) (Pleistocene or Pliocene) – Unconsolidated pebble, cobble, and boulder gravel on the north flank of the Uinta Mountains in the northeastern part of the Salt Lake City quadrangle. Also mapped in T3N, R7E, in north-central part of Salt Lake City quadrangle. Maximum thickness ~130 ft (Bryant, 1992).

Qe Quaternary: Surficial eolian deposits(Hintze et al., 2000). Eolian deposits (Qe) (Holocene and Pleistocene) – Well-sorted fine-grained windblown sand and silt, largely stabilized by vegetation (Rowley et al., 1985). Eolian sand (Qe) (Holocene and Pleistocene) – Silty to slightly clayey, fine- to medium- grained sand; forms dunes as high as 23 ft (Bryant, 1992).

Qg Quaternary: Surficial glacial deposits(Hintze et al., 2000). Till of Pinedale age (Qtp) (Pleistocene) – Unsorted gravel and sand deposited by glaciers; locally occurs as well-defined moraines. Located in Uinta Mountains near western edge of Vernal quadrangle (Rowley et al., 1985). Glacial outwash of Pinedale age (Qgp) (Pleistocene) – Poorly sorted gravel and sand deposited by glacial melt water (Rowley et al., 1985). Till of Bull Lake age (Qtb) (Pleistocene) – Unsorted gravel and sand deposited by glaciers. Located in Uinta Mountains near western edge of Vernal quadrangle (Rowley et al., 1985). Glacial outwash of Bull Lake age (Qgb) (Pleistocene) – Poorly sorted gravel and sand deposited by glacial melt water (Rowley et al., 1985). Old till (Qto) (Pleistocene) – Unsorted gravel and sand deposited by glaciers; probably pre-Bull Lake in age. Recognized only in area of West Fork Carter Creek in Uinta Mountains near western edge of Vernal quadrangle (Rowley et al., 1985). Till of Pinedale age (Qtp) (Pleistocene) – Poorly sorted boulder till. May include some colluvium, talus, and landslide deposits (Bryant, 1992). Outwash deposits of Pinedale age (Qgp) (Pleistocene) – Poorly sorted gravel and sand (Bryant, 1992). Till of Bull Lake age (Qtb) (Pleistocene) – Poorly sorted boulder till; Bull Lake age till contains fewer undrained depressions than do Pinedale age moraines; terminal moraines are more widely breached by streams (Bryant, 1992).

10-29 Glacial outwash of Bull Lake age (Qgp) (Pleistocene) – Poorly sorted gravel and sand. Surface grades to terminal moraine of Bull Lake age (Bryant, 1992). Till of pre-Bull Lake age (Qtpb) (Pleistocene) – Poorly sorted boulder till; and generally more dissected than till of Bull Lake age. Locally forms broad, high gently sloping moraines (Bryant, 1992). Glacial outwash of pre-Bull Lake age (Qgpb) (Pleistocene) – Poorly sorted gravel and sand in terraces. Surface grades to pre-Bull Lake moraines (Bryant, 1992). Till (Qut) (Pleistocene) – Till deeply dissected by Holocene and Pleistocene erosion in east-central Salt Lake City quadrangle (Bryant, 1992). Glacial outwash (Qug) (Pleistocene) – Compound outwash apron formed during several glaciations; surface material; poorly sorted gravel and sand. Surface grades to terminal moraine of Bull Lake age along Beaver Creek in northeastern Salt Lake City quadrangle (Bryant, 1992). Till of pre-Pinedale age (Qto) (Pleistocene) – Poorly sorted boulder till having more subdued morainal topographic expression than till of Pinedale age. Mapped on north side of Uinta Mountains and at their west end, where the age of tills older than till of Pinedale age is unknown. Many of these deposits may be of pre-Bull Lake age (Bryant, 1992). Glacial outwash of pre-Pinedale age (Qgo) (Pleistocene) – Poorly sorted gravel and sand in terraces. Surface grades to moraines of till of pre-Pinedale age (Bryant, 1992.)

Qls Quaternary: Surficial landslide deposits(Hintze et al., 2000). Landslide deposits (Ql) (Holocene and Pleistocene) – Predominantly earthflows and rotational slumps on steep slopes (Rowley et al., 1985). Landslide deposits (Ql) (Holocene and Pleistocene) – Clay to large blocks of rock more than 230 ft in diameter. Deposited by sliding and slumping; includes some material deposited by debris flows (Bryant, 1992).

Upper Tertiary geologic units, Utah

T5 Upper Tertiary: Miocene-Pliocene: Sevier River, Browns Park, Castle Valley Formations (conglomerate) (Hintze et al., 2000). Browns Park Formation (Tbp) (Miocene) – White, light gray, and tan, poorly to moderately consolidated, generally crossbedded, partly tuffaceous sandstone; subordinate conglomerate, siltstone, and white crystal-poor, glassy, rhyolitic air-fall tuff; and minor limestone (Rowley et al., 1985). Includes massive chert beds west of Little Snake River. Mostly of fluvial and eolian origin, but includes lacustrine claystone and air-fall tuff in Browns Park. Characterized by abundant, fine-grained volcaniclastic material. Especially near base may contain light red, light orange, and light yellow conglomerate beds that contain abundant clasts of the Uinta Mountain Group (Yu) and subordinate Paleozoic limestone. Preserved mostly within the Uinta Mountains and eastward to and beyond Maybell, Colorado. Thickness highly variable, maximum ~1,640 ft (Rowley et al., 1985).

10-30 Lower Tertiary geologic units, Utah

T4 Lower Tertiary: Oligocene-Pliocene: Salt Lake Formation and other valley-filling alluvial, lacustrine, and volcanic units (conglomeratic sandstone) (Hintze et al., 2000). Bishop Conglomerate Oligocene (Hintze et al., 2000) – Equivalent to Tbi unit in Wyoming. Bishop Conglomerate (Tbc) (Oligocene) – Light-gray and pink, poorly to moderately consolidated, fluvial, partly tuffaceous conglomerate, sandstone, and minor light gray to light pinkish gray biotitic air-fall tuff; clasts mostly from Uinta Mountain Group (Yu) but partly from Paleozoic limestone (locally predominant) and other rock types. Thick- ness highly variable, maximum ~500 ft (Rowley et al., 1985). Bishop Conglomerate (Tbc) (Oligocene) – Boulder to pebble conglomerate and sandstone; poorly cemented and rarely forms outcrops; a bed of tuff and tuffaceous sandstone locally exposed near or at its base. Thickness as much as 500 ft on north side of Uinta Mountains (Bryant, 1992).

T3 Lower Tertiary: Eocene-Oligocene: Duchesne River, Uinta, Bridger, Crazy Hollow, and other formations (Bridger Formation north of Uinta Mountains, equivalent to Uinta Formation south of Uinta Mountains) (mudstone, siltstone, conglomerate, and sandstone) (Hintze et al., 2000). Bridger Formation (Tb) (Eocene) – Soft, gray, green, tan, red, brown, white, yellow, and turquoise blue fluvial and lacustrine shale, mudstone, claystone, siltstone, and minor sandstone and limestone; locally tuffaceous; locally contains silicified snail fossils and algal heads. Exposures in the northeastern part of the Vernal quadrangle largely equivalent to Adobe Town Member of Washakie Formation in Washakie Basin in Wyoming. Thickness ~660 ft (Rowley et al., 1985). Upper part of Bridger Formation (Tbu) (Eocene) – Resistant, light gray, tan, and yellow conglomerate, sandstone, and limestone. Mapped only in Corson Park area in northwestern corner of Vernal quadrangle. Thickness ~1,475 ft (Rowley et al., 1985). Lower part of Bridger Formation (Tbl) (Eocene) – Mostly soft, tan, pale yellow, light gray, and light green sandstone, shale, and limestone. Mapped only in northwestern corner of Vernal quadrangle. Thickness ~500 ft (Rowley et al., 1985). Bridger Formation (Tbr) (Eocene) – Yellow-gray to light yellowish brown, brownish gray, and white, thinly laminated limestone containing nodules and lenses of brownish black and dark gray chert; white, very light greenish gray and yellowish gray medium- grained sandstone; red silty sandstone; carbonaceous siltstones; and silty limestone. Mapped only in northeastern Salt Lake City quadrangle. Thickness at least 500 ft (Bry- ant, 1992).

[T2] [Lower Tertiary: Eocene: Green River Formation – Not mapped in the Utah portion of the Green River Basin (Hintze et al., 2000).]

T1 Lower Tertiary: Cretaceous-Eocene: Wasatch, Colton, Flagstaff, Claron, White Sage, and other formations (Hintze et al., 2000). Wasatch Formation (Tw) (Eocene and Paleocene) – Soft, light gray, red, green, white, yellow, and purple claystone, shale, sandstone, siltstone, and conglomeratic sandstone; fluvial and lacustrine in origin; intertongues with the Green River Formation. Mapped on northern margin of Piceance Creek Basin. Maximum thickness ~4,600 ft, thinning northward to zero thickness along Asphalt Ridge-Raven Ridge (Rowley et al., 1985).

10-31 T1 Cathedral Bluffs Tongue of Wasatch Formation (Twc) (Eocene) – Soft, light to medium gray, red, pink, yellow, and maroon shale, claystone, mudstone, siltstone, and minor lenticular sandstone and oil shale. Mapped within and west of Sand Wash Basin. Thickness 1,000-3,300 ft (Rowley et al., 1985). Niland Tongue of Wasatch Formation (Twn) (Eocene) – Soft and moderately resistant, tan, light to dark gray, brown, red, and yellow sandstone, shale, siltstone, oil shale, carbonaceous shale, and coal. Mapped in Vermillion Creek area. Thickness 100-460 ft (Rowley et al., 1985). Main body of Wasatch Formation (Twm) (Eocene and Paleocene) – Soft, tan, gray, yellow, and red shale, claystone, sandstone, conglomeratic sandstone, and marly limestone. Very conglomeratic along northern flank of Uinta Mountains. Mapped in northern and northeastern Vernal quadrangle. Thickness ~2,300- 3,600 ft (Rowley et al., 1985). Wasatch Formation (Tw) (Eocene and Paleocene) – Moderate red, grayish red, pale red, reddish brown, and gray sandstone, conglomerate, siltstone, and mudstone; contains scattered thin lenticular beds of light-purplish-gray to light- gray nonmarine limestone; rapid facies changes; and conglomerate contains a variety of pebble- to boulder-size clasts, reflecting diverse source rocks. North of the Uinta Mountains, facies change from coarse conglomerate on the flank of the mountains to sandstone and siltstone, then to lacustrine rocks of the Green River Formation and lacustrine and alluvial rocks of the Bridger Forma- tion in the Green River basin. The transition to the Green River and Bridger Formations occurs very close to the Salt Lake City quadrangle eastern bound- ary from west of Blacks Fork eastward to Burnt Fork, Utah. This transition is mostly concealed by landslides and slumping involving the overlying Bishop Conglomerate and, in the Beaver Creek-Burnt Fork region in northeastern Salt Lake City quadrangle, by a tongue of Wasatch conglomerate (Bryant, 1992). Fort Union Formation (Tf) (Paleocene) – Mostly soft, light gray, white, tan, light green, and brown sandstone, shale, and claystone, and subordinate carbonaceous shale, coal, siltstone, and conglomerate; mainly of fluvial and lacustrine origin. Exposed thickness and subsurface thickness as much as 2,950 ft (Rowley et al., 1985).

Mesozoic hydrogeologic units, Utah Upper Cretaceous hydrogeologic units, Utah

K3 Upper Cretaceous: Mesaverde Group, Price River, Kaiparowits, Echo Canyon, and other formations (sandstone and coal) (Hintze et al., 2000). Lance Formation and Fox Hills Sandstone (Kla) (Upper and Lower Cretaceous) – Ex- posed at surface only in Maybell, Colorado area (Rowley et al., 1985). Lance Formation (Upper Cretaceous) – Resistant, light gray and yellowish brown sandstone, siltstone, shale, and coal; mostly of continental origin. Thick- ness ~820-1,310 ft (Rowley et al., 1985). Fox Hills Sandstone (Upper Cretaceous) – Moderately resistant, gray and buff lenticular sandstone; mostly of marine origin. Thickness less than 100 ft (Row- ley et al., 1985). Lewis Shale (Kls) (Upper Cretaceous) – Soft, dark gray limy marine shale and subordinate sandstone. Exposed at surface only in Maybell, Colorado area, where the thickness is 560-1,310 ft (Rowley et al., 1985).

10-32 Mesaverde Group (Upper Cretaceous) – Sandstone and coal (Hintze et al., 2000). Mesaverde Group, undivided (Kmvg) (Upper Cretaceous) – Largely resistant, light gray, tan, yellow, purplish brown crossbedded sandstone; dark gray shale; and minor coal. Locally conglomeratic on northern flank of Uinta Mountains. Mostly of continental origin. Exposed thickness as much as 2,000 ft (Rowley et al., 1985). Units of Mesaverde Group and Buck Tongue of Mancos Shale (Upper Cretaceous) in Douglas Creek Arch, northwestern Piceance Creek Basin, Utah (Rowley et al., 1985). Upper unit of Mesaverde Group (Kmvu) – Resistant, tan, light gray, and yellow lenticular crossbedded sandstone and subordinate shale, carbonaceous shale, and minor coal. Thickness 1,000-1,150 ft (Rowley et al., 1985). Coal unit of Mesaverde Group (Kmvc) – Moderately resistant, light- to medium gray, light yellow, light orange, and tan crossbedded sandstone, carbonaceous shale, and coal. Thickness 410-660 ft (Rowley et al., 1985). Lower unit of Mesaverde Group (Kmvl) – Moderately resistant, tan, light to medium gray, and light yellow crossbedded sandstone and subordinate shale, carbonaceous shale, and coal. Thickness 660-820 ft (Rowley et al., 1985). Mesaverde Group (undivided) (Kmv) – Upper, coal, and lower units, undivided (Rowley et al., 1985). Sego Sandstone, Buck Tongue of Mancos Shale, and Castlegate Sandstone (Ksc) – Sego Sandstone – Resistant, light gray, tan, buff, and orange marine sandstone and shale. Thickness <246 ft. Buck Tongue – Soft, medium to dark gray, yellow-weathering marine shale and, locally, tan thin-bedded sandstone. Thickness 230-560 ft. Castlegate Sandstone – Resistant, light gray, yellow, and tan marine sandstone and minor shale. Thickness <100 ft (Rowley et al., 1985). Buck Tongue of Mancos Shale and Castlegate Sandstone (Kbc). Units of Mesaverde Group, northeastern Piceance Creek Basin, Utah Williams Fork Formation (Kw) – Moderately resistant, light to medium brown, orange, tan, and gray lenticular beds of sandstone, shale, claystone, carbonaceous shale, and coal. Thickness 1,310-2,950 ft (Rowley et al., 1985). Iles Formation (Ki) – Resistant to moderately resistant, light gray, tan, and orange sandstone, shale, claystone, carbonaceous shale, and coal. In the Elk Springs, Colorado area, includes Sego Sandstone. Locally includes, at top, Trout Creek Sandstone Member – Light gray crossbedded sandstone as much as 100 ft thick. Thickness 590-1,400 ft (Rowley et al., 1985).

K2 Upper Cretaceous: Indianola, Mancos, Frontier, Straight Cliffs, Iron Springs, and other formations (Hilliard Shale and Blair Formation north of Uinta Mountains, overlying Frontier Formation and Mowry Shale) (sandstone, siltstone, and shale) (Hintze et al., 2000). Mancos Shale (Km) (Upper Cretaceous) – Soft, medium to dark gray, yellow-weathering bentonitic, locally fossiliferous, marine shale and minor siltstone and sandstone. Thickness 4,600-5,575 ft (Rowley et al., 1985). Hilliard Shale (Kh) (Upper Cretaceous) – Soft, medium to dark gray, yellow-weathering marine shale and minor sandstone. Mapped only near northern edge of Vernal quadrangle west of 109° W. Thickness ~6,230 ft (Rowley et al., 1985). Adaville and Hilliard Formations (Kah) (Upper Cretaceous) – Yellowish gray to white, thinly laminated, crossbedded sandstone containing some scattered pebbles and beds of pebble conglomerate; clasts predominantly sandstone, siliceous shale of the Aspen Shale, and chert; a few beds have reddish-brown-weathering concretions as much as 50 millimeters (or 2 inches) in diameter; includes interbedded gray siltstone and mudstone, and gray marine shale. Mapped only in lower plate of the Absaroka thrust in Crandall Canyon-Frazier Hollow, Utah area. Thickness uncertain because of structural complexi- ties, but probably at least 14,900 ft (Bryant, 1992).

10-33 Frontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone (Kfd) (Upper and Lower Cretaceous) (Rowley et al., 1985). Frontier Sandstone Member of Mancos Shale (Upper Cretaceous) – Resistant, yellow and tan, fossiliferous, locally crossbedded, marine sandstone and minor continental carbonaceous shale and coal. Thickness 115-300 ft (Rowley et al., 1985). Mowry Shale Member of Mancos Shale (Lower Cretaceous) – Soft, silvery gray and blu- ish gray, siliceous marine shale and bentonite; contains abundant fish scales. Thickness 33-230 ft (Rowley et al., 1985). Dakota Sandstone (Lower Cretaceous) – Resistant, yellow and light gray, crossbedded, mostly fluvial sandstone and subordinate pebble conglomerate, and minor shale and coal. Thickness 33-260 ft (Rowley et al., 1985). Frontier Formation (Kfu) (Upper Cretaceous) Frontier Formation – upper member (Kfu) – Light yellowish gray marine sandstone, gray marine shale, gray to brown siltstone and silty shale, and coal. Con- glomerate 20-100 ft thick at base in Coalville area contains rounded pebbles and cobbles of sandstone and limestone. Thickness 2,625-3,600 ft in Coalville, Utah area, 5,250 ft in East Canyon Creek, Utah area (Bryant, 1992). Frontier Formation – lower member (Kfl) – Gray marine shale and coal; gray, light red, grayish red and green claystone; silty shale; sandstone; and conglomeratic sandstone. Thickness 4,500 ft in Coalville, Utah area, ~5,900 ft along East Canyon Creek, Utah area (Bryant, 1992). Oyster Ridge Sandstone Mem- ber (unmapped) – Located at the top of the lower member (Bryant, 1992). Frontier Formation – conglomerate facies (Kfc) – Conglomerate containing interbeds of sandstone and, rarely, red and gray siltstone and mudstone; contains rounded pebbles and cobbles of sandstone and limestone from Mesozoic and late Paleozoic units. Locally contains boulders as much as 3.3 ft in diameter. Three tongues of conglomerate in the East Canyon Creek, Utah area merge west into one unit 4,300 ft thick (Bryant, 1992). Upper and Lower Cretaceous Rocks (Ku) (Lower and Upper Cretaceous) – Gray shale and yellowish gray sandstone. North of the Uinta Mountains, near Moffit Pass, Utah, contains siliceous shale and coal and correlates with lower member of Frontier Forma- tion (Kfl) and Aspen Shale (Ka). East of Beaver Creek, Utah, in northwestern corner of Salt Lake City quadrangle, correlates with Mesaverde Formation (Kmu) and (or) Frontier Member of Mancos Shale (Kmf) (Bryant, 1992).

Lower Cretaceous geologic units, Utah

K1 Lower Cretaceous: Dakota, Cedar Mountain, Kelvin, and other formations (Dakota and Cedar Mountain Formations in Utah equivalent to Cloverly Formation in Wyoming) (sandstone, siltstone, and shale) (Hintze et al., 2000). Cedar Mountain Formation (Lower Cretaceous) and Morrison Formation (Upper Juras- sic) (KJcm) – Mapped in Vernal-Elk Springs, Colorado area (Rowley et al., 1985). Cedar Mountain Formation (Kc) (Lower Cretaceous) – Comprises two members of mainly fluvial origin: upper member of soft, purple, gray, and greenish-gray shale, mudstone, siltstone, and minor limestone; and lower, discontinuous Buckhorn Conglomer- ate Member – Resistant, medium- to dark-gray and tan crossbedded conglomerate and sandstone. Mapped in Dinosaur, Colorado area. Thickness as much as 200 ft (Rowley et al., 1985). Cedar Mountain Formation (Lower Cretaceous), Morrison Formation, Stump Forma- tion, Entrada Sandstone, and Carmel Formation (Upper and Middle Jurassic) (KJmsc) – Mapped northeast of the town of Blue Mountain, Utah (Rowley et al., 1985).

10-34 K1 Aspen Shale (Ka) (Lower Cretaceous) – Dark gray siliceous shale and silty shale containing scales of teleost fish. Maximum thickness ~525 ft north of Peora, Utah; thins to west and north (Bryant, 1992). Sage Junction Formation (Ks) (Lower Cretaceous) – Light gray and pinkish gray mudstone; yellowish gray, light-brown, and gray siltstone; and fine-grained sandstone containing white, green, and pink porcellanite interbeds. Mapped only in upper Chalk Creek, Utah area, north-central Salt lake City quadrangle (Bryant, 1992). Upper and Lower Cretaceous rocks (Ku) (Lower and Upper Cretaceous) – Gray shale and yellowish gray sandstone. North of Uinta Mountains, the Ku unit contains siliceous shale and coal and correlates with lower member of Frontier Formation (Kfl) and Aspen Shale (Ka). To the east, the Ku unit correlates with Mesaverde Formation (Kmu) and (or) Frontier Member of Mancos Shale (Kmf) (Bryant, 1992).

Jurassic geologic units, Utah

J2 Jurassic: Morrison Formation (sandstone and shale/mudstone) (Hintze et al., 2000). Morrison Formation (Jm) (Upper Jurassic) – Soft, light gray, olive gray, red, and light purple shale, claystone, siltstone, and minor interbedded, crossbedded sandstone and bentonite; mainly of fluvial origin; includes theBrushy Basin Member – Mostly mudstone and minor sandstone, and underlying Salt Wash Member – Interbedded sandstone and mudstone. Locally includes, at the base, the thin Windy Hill Sandstone Member of the Sundance Formation (Upper Jurassic) – Soft, gray sandstone. Thickness 500–1,150 ft, thinning west to east (Rowley et al., 1985). Morrison Formation, Stump Formation, and Entrada Sandstone, and Carmel Forma- tion (Jmse) (Upper and Middle Jurassic) – Mapped north of Elk Springs, Colorado area (Rowley et al., 1985). Morrison Formation, Stump Formation, Entrada Sandstone, and Carmel Formation (Jmsc) (Upper and Middle Jurassic) (Rowley et al., 1985). Morrison and Stump Formations Limestone (Jms) (Middle and Upper Jurassic) – Mapped north and east of Peoa, Utah, below the Absaroka thrust (Bryant, 1992). Morrison Formation (Upper Jurassic) – White to grayish purple sandstone, moderate reddish orange silty sandstone, and gray limestone; a few beds of chert pebble conglomerate near top. Thickness 265 ft (Bryant, 1992). Stump Formation (Upper Jurassic) – Thickness 150–220 ft (Bryant, 1992). Redwater Member of Stump Formation (Upper Jurassic) – Light to dark gray-green shale; greenish gray siltstone; and light gray, white, dark greenish-gray, and brown limestone and glauconitic sandstone (Bryant, 1992). Curtis Member of Stump Formation (Middle Jurassic) – Greenish gray and white, fine-grained calcareous and glauconitic sandstone. In Currant Creek, Utah area, white, pink, red, dark-red, and pale-lav- ender limestone and sandy limestone, and gray shale locally in upper part of the member (Bryant, 1992).

10-35 J1 Jurassic: Summerville, Entrada, Carmel, Arapien, Twin Creek, and other formations (Hin- tze et al., 2000). Stump Formation, Entrada Sandstone, and Carmel Formation (Jsc) (Upper and Middle Jurassic) (Hintze et al., 2000). Stump Formation (Upper and Middle Jurassic) – Consists of two members of marine origin: the Redwater Member (Upper Jurassic) – Soft, olive green and light green, fissile glauconitic shale and siltstone and sparse interbedded tan and gray, ripple-marked sandy fossiliferous, glauconitic oolitic limestone and sandstone. Underlying Curtis Member (Middle Jurassic) – Resistant, light gray crossbedded fossiliferous glauconitic sandstone. Thickness as much as 260 ft (Rowley et al., 1985). Entrada Sandstone (Middle Jurassic) – Resistant, light gray, buff, or pink, crossbedded sandstone; mainly of eolian origin. In Manila, Utah area, contains interbedded reddish- brown siltstone (Preuss Red Beds). Thickness 100-250 ft (Rowley et al., 1985). Carmel Formation (Middle Jurassic) – Soft, medium- to dark-red and green sandy shale, sandstone, siltstone, mudstone, limestone, and gypsum; marine in origin. In Manila, Utah area, contains 65-85 ft of fossiliferous limestone at base. Thickness 0-400 ft, thins west to east (Rowley et al., 1985). Stump Formation and Entrada Sandstone (Jse) (Upper and Middle Jurassic) – Mapped northwest of Elk Springs, Colorado (Rowley et al., 1985).

Jg Jurassic: Glen Canyon Group (Navajo, Kayenta, Wingate, Moenave Formations) and Nugget Sandstone (Hintze et al., 2000). Glen Canyon Sandstone (Lower Jurassic and Upper Triassic) and Chinle Formation (Upper Triassic) (J!gc) (Upper Triassic) (Rowley et al., 1985). Glen Canyon Sandstone (J!g) (Lower Jurassic and Upper Triassic) – Resistant, pink, light gray, and buff, prominently crossbedded sandstone; mainly of eolian origin. Formerly called Navajo Sandstone or, in the north, Nugget Sandstone. Thickness 660–1,000 ft; thins west to east (Rowley et al., 1985).

Triassic geologic units, Utah

!1 Triassic: Moenkopi, Dinwoody, Woodside, Thaynes, and other formations(Hintze et al., 2000). Thaynes Limestone (!t) (Lower Triassic) – Light gray, thin- to thick-bedded limestone; brownish gray siltstone; and subordinate light gray sandstone, pale red silty limestone, light gray shaly limestone, and dark greenish gray siltstone and shale. In eastern Salt Lake City quadrangle, interfingers and intergrades with nonmarine redbeds above and below. Thickness 2,000 ft north of Emigration Canyon (Utah), 360 ft at Lake Fork River on south side of Uinta Mountains (Bryant, 1992). Woodside Shale (!w) (Lower Triassic) – Grayish red, grayish purple, reddish brown, and medium red shale, siltstone, and fine-grained sandstone, and thin white limestone beds that grade to grayish red siltstone. Locally at the base, ~100 ft of green or greenish gray shale and siltstone: a tongue of Dinwoody Formation in northeastern Salt Lake City quadrangle. White, gray, and greenish-gray beds of shale, siltstone, and limestone represent interbeds of and gradation into Thaynes Limestone. Thickness 660–1,000 ft along flanks of Uinta Mountains (Bryant, 1992). Thaynes Limestone and Woodside Shale (!tw) (Lower Triassic) – Widely mapped in Wasatch Range and northeastern flank of Uinta Mountains (Bryant, 1992).

10-36 !1 Chinle Formation (!c) (Upper Triassic) – Soft to moderately resistant, medium- to dark-red, light gray, purple, and light green, ripple-marked siltstone, sandstone, claystone, shale, and conglomerate; mainly of fluvial and lacustrine origin. At base, locally includes Gartra Member – Light yellow, light gray, or pink crossbedded fluvial sandstone and conglomerate as much as 100 ft thick. Thickness 200–460 ft, generally thins west to east. The dominant lithologies of the Chinle Formation are siltstone, sandstone, claystone, and shale (Rowley et al., 1985). Moenkopi Formation (!m) (Lower Triassic) – Moderately resistant, medium to dark red, reddish brown, green, and gray, ripple-marked siltstone and shale, locally sandy and gypsiferous; marine and continental in origin. Thickness 150–1,115 ft; thins west to east (Rowley et al., 1985). Moenkopi Formation (!m) (Lower Triassic) – Moderate red and reddish brown siltstone and yellowish gray and pinkish gray sandstone. Partial section 660 ft thick exposed in Burnt Fork, Utah area in northeastern Salt Lake City quadrangle (Bryant, 1992). Moenkopi Formation and Dinwoody Formation (!md) (Lower Triassic) – Mapped in northwest Vernal quadrangle (Rowley et al., 1985). Dinwoody Formation (!d) [!1] (Lower Triassic) – Soft, light gray, greenish gray, or white, thin-bedded, ripple-marked marine shale, siltstone, sandstone, and minor limestone. Mapped in northwest Vernal quadrangle. Thickness as much as 525 ft; thins north to south (Rowley et al., 1985).

Paleozoic geologic units, Utah

P2 Permian: Kaibab, Toroweap, Park City, and other formations (limestone and shale) (Hintze et al., 2000). Park City Formation (Pp) [P2] (Lower Permian) – Soft, light gray, light yellow, and red, locally fossiliferous siltstone, sandstone, dolomite, limestone, and shale underlain by resistant, light gray, tan, and light yellow, locally fossiliferous sandstone, sandy cherty limestone, dolomite, claystone, and phosphatic shale; marine in origin. In northwest Vernal quadrangle, includes the Franson Member – Cherty dolomite, limestone, mudstone, sandstone, siltstone, and shale, thickness 82–164 ft; and Meade Peak Phosphatic Shale Member of the Phosphoria Formation – Phosphatic rocks as much as 50 ft thick. Total thickness as much as 425 ft; thins to east and southeast (Rowley et al., 1985). Park City Formation and Related Rocks (Pp) (Permian) – Fossiliferous and cherty, gray to pinkish gray limestone, calcareous siltstone, and cherty sandstone containing, in the middle, a dark gray phosphatic shale (Meade Peak Phosphatic Shale Member of Phosphoria Formation) – Upper part contains ~100 ft of moderate red siltstone and mudstone, reddish brown and pale red sandstone and subordinate cherty limestone in the Lake Fork River and Burnt Fork, Utah areas. Thickness 330 ft in eastern Salt lake City quadrangle (Bryant, 1992).

10-37 P$ Pennsylvanian-Permian: Oquirrh Group, Wells, Weber, Ely, Callville, and other formations (Hintze et al., 2000). Weber Sandstone (P$w) [P$] (Permian and Pennsylvanian) – Resistant, light gray and buff, prominently crossbedded sandstone, mixed eolian and marine in origin. Thick- ness 660–1,540 ft; thins west to east, and thins north to south in Uinta Mountains area (Rowley et al., 1985). Weber Sandstone (P$w) (Lower Permian to Middle Pennsylvanian) – Composed of pale yellowish gray to white crossbedded quartzite and calcareous sandstone and a few beds of light gray to white limestone and dolomite; large-scale cross-bedding prominent in upper part in eastern half of Salt Lake City quadrangle. Thickness generally 1,000- 1,640 ft (Bryant, 1992). $ Pennsylvanian: Morgan, Round Valley, Honaker Trail, Paradox, Ely, and other formations (Hintze et al., 2000). Morgan Formation ($m) [$] (Middle Pennsylvanian) – Resistant, light to medium red, yellow, and gray, locally crossbedded sandstone and interbedded light to medium gray limestone, and minor soft, red shale; underlain by mostly soft, light gray, red, and green shale, siltstone, sandstone, and limestone; marine in origin. Limestone contains inverte- brate fossils and red chert concretions; top intertongues with base of Weber Sandstone. Top of Morgan Formation placed at top of highest limestone or red sandstone. Thick- ness 35-1,150 ft; thins west to east, and thins north to south in Uinta Mountains area (Rowley et al., 1985). Morgan Formation ($mr, including Round Valley Limestone) (Middle Pennsylva- nian) – Grayish red calcareous siltstone and silty limestone; light greenish gray siltstone; grayish red or reddish brown sandstone; gray fossiliferous limestone containing gray, yellowish gray, reddish brown, or pinkish orange chert; and white to light gray sandstone. Gradational contact with overlying Weber Quartzite (or Weber Sandstone). Thickness ~330 ft (Bryant, 1992). Round Valley Limestone ($mr, including Morgan Formation) [$] (Lower Pennsylva- nian) – Resistant, light to medium gray and blue-gray limestone and interbedded soft, light gray and red shale; marine in origin. Limestone generally fossiliferous and contains red and pink chert concretions. Thickness 165–500 ft, thins away from Uinta Moun- tains (Rowley et al., 1985). Round Valley Limestone ($mr, including Morgan Formation) (Lower Pennsylvanian) – Light-gray-weathering, gray to dark gray, fossiliferous limestone containing gray and reddish gray chert and interbeds of gray and light green shale and siltstone, grayish red silty shale, and sandstone and sandy limestone. Pale reddish orange silicified fossils char- acteristic. Thickness 425 ft in Wasatch Range, 200 ft on north side of Uinta Mountains (Bryant, 1992).

10-38 M2 Mississippian [Upper]: Great Blue, Humbug, Deseret, and other formations (Hintze et al., 2000). This M2 unit includes Doughnut Shale, Humbug Formation, Madison Limestone, and correlative rocks; thinning away from the Uinta Mountains (Rowley et al., 1985). Doughnut Shale (Mr) [M2] (Upper Mississippian) – Soft, dark gray, light green, and red clay shale and moderately resistant, light gray and light yellow sandstone and limestone. Marine and continental in origin. Thickness 35–560 ft (Rowley et al., 1985). Doughnut Formation (Mdo) (Upper Mississippian) – Medium gray thin-bedded limestone containing pods of dark gray to black chert and abundant fossils. A zone from 35–100 ft of black, greenish, or locally reddish shale at base contains thin beds of greenish gray to rusty-weathering silty limestone. Basal black shale contains thin beds of dark gray limestone and rusty-weathering sandstone in Uinta Mountains. Thickness ~425 ft in Wasatch Range, 200–300 ft in Uinta Mountains (Bryant, 1992). Humbug Formation (Mr) [M2] (Upper Mississippian) – Soft to moderately resistant, tan, pink, light gray, and red, locally crossbedded sandstone, limestone, and red and black shale; marine in origin. Thickness 100-360 ft (Rowley et al., 1985). Humbug Formation (Mh) (Upper Mississippian) – Medium to dark gray limestone and dolomite, and limestone breccia containing beds of reddish brown to yellowish gray, brown-weathering sandstone and sparse interbeds of red siltstone. Thickness 330–920 ft (Bryant, 1992). M1 Mississippian [Lower]: Redwall, Madison, Gardison, Lodgepole, and other formations (Hin- tze et al., 2000). Madison Limestone (Mr) [M1] (Lower Mississippian) – Resistant, tan, light yellow, and light to dark gray, locally fossiliferous cherty marine limestone, locally dolomitic. Thick- ness 430–1,000 ft (Rowley et al., 1985). Madison Limestone (Mm) (Upper and Lower Mississippian) – Fine- to coarse-grained, dark gray dolomite and limestone and dolomite; abundant gray and white chert in some beds. Dark to light gray, thin- to medium-bedded, fossiliferous limestone near base. At base locally in western Uinta Mountains: more than 10 ft of dolomite underlain by dolomitic shale and sandstone, and conglomerate. Thickness as much as 1,000 ft (Bry- ant, 1992).

^1 Cambrian: Prospect Mountain, Tintic, Geertsen Canyon, and other formations (Lodore Sandstone) (Hintze et al., 2000). Lodore Formation (^l) (Upper Cambrian) – Ledge-forming, light brown, pink, and greenish gray sandstone and pebble conglomerate; overlain by soft, pink, tan, and light greenish gray, fossiliferous, glauconitic shale and interbedded tan and light green crossbedded sandstone; east of Canyon of Lodore, shale has been largely removed by pre-Mississippian erosion; marine in origin. Thickness as much as 590 ft (Rowley et al., 1985). Cambrian Rocks – Northeast of Rock Creek in Uinta Mountains [Lodore Formation] (^u) (Cambrian) – Limestone with pink mottling, sandy yellowish gray limestone, pinkish gray limestone, grayish red sandstone, and coarse-grained sandstone overlying yellowish brown glauconitic sandstone containing green shale interbeds and shaly sandstone above quartzite; lower two units resemble Lodore Formation mapped in Dinosaur National Monument 62 miles to east. Thickness ~460 ft (Bryant, 1992).

10-39 Precambrian geologic units, Utah

p^s Precambrian: sedimentary and metasedimentary formations (Hintze et al., 2000). Y (Precambrian: Proterozoic II) Red Pine Shale of Uinta Mountain Group (950 Ma) (Hintze et al., 2000). Y (Precambrian: Proterozoic II) Uinta Mountain Group (thickness 24,000 ft along Green River of Utah) [sandstone, shale, and conglomerate] (Hintze et al., 2000). Uinta Mountain Group (Yu) (Precambrian: Middle Proterozoic) – Resistant, light to dark red, crossbedded, locally pebbly sandstone and locally gray, green, and red silty shale; fluvial and marine in origin. Includes grayish red and greenish gray shale and fine-grained sandstone of Red Pine Shale in upper part of the group at western edge of Vernal quadrangle. Maximum thickness probably >23,000 ft (Rowley et al., 1985).

Yu Precambrian: Uinta Mountain Group Red Pine Shale (Yur) (Middle Proterozoic) – Grayish black to olive drab siltstone and shale containing thin discontinuous beds of quartzite and arkose; contains abundant sandstone and conglomerate. Maximum thickness 5,900 ft in west Uinta Mountains (Bryant, 1992). Hades Pass unit (Yuh) (Middle Proterozoic) – Grayish red, brownish red, and whitish gray quartz sandstone, arkose, and shale containing thick moderate red lenticular shale beds on northern side of Uinta Mountains. Thickness 5,900-9,800 ft (Bryant, 1992). Mount Watson unit (Yuw) (Middle Proterozoic) – Thick-bedded, yellowish gray to grayish white, lithic arkose and fine-grained quartzite containing thin, lenticular, olive drab shale and siltstone beds. Thickness 3,300 ft (Bryant, 1992). Dead Horse Pass unit (Yud) (Middle Proterozoic) – Pink to red, fine- to medium- grained quartzite and arkosic quartzite; some beds of olive to dark olive green and locally reddish brown shale and siltstone; includes Mount Agassiz unit and intertongues with Mount Watson unit. Thickness ~3,000 ft (Bryant, 1992). Red Castle unit (Yuc) (Middle Proterozoic) – Moderate red to grayish red and reddish brown, pebbly, arkosic sandstone and feldspathic shale and siltstone; intertongues with Dead Horse Pass unit. Thickness >2,400 ft (Bryant, 1992). Moosehorn Lake unit (Yum) (Middle Proterozoic) – Moderate red to reddish brown and olive to dark olive green shale and siltstone containing thin lenticular quartzite and arkose beds. Thickness ~1,000 ft (Bryant, 1992).

p^m Precambrian: metamorphic rocks (Hintze et al., 2000). W (Precambrian: Proterozoic I) Red Creek Quartzite (thickness 20,000 ft along Green River of Utah) (2,300 Ma) (Hintze et al., 2000). Red Creek Quartzite (XWr) (Precambrian: Late Archean – Early Proterozoic(?)) – Resis- tant, white, gray, tan, and light green metaquartzite; subordinate quartz-muscovite schist and ortho-amphibolite; minor marble. Mostly metamorphosed sedimentary rocks, but includes metamorphosed igneous rocks. Map unit includes granitic and quartzo- feldspathic gneiss, located north of Browns Park, on the Colorado-Utah border (Rowley et al., 1985).

10-40 Appendix 2 Trilinear diagrams, environmental water samples, major-ion composition and TDS

10-41 100 100 A. Alluvium B. Browns Park Formation 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 100 0 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 60 0 20 40 60 80 40 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

100 100 C. Washakie Formation D. Bridger Formation 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 100 0 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 40 60 0 20 60 80 100 40 80 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

EXPLANATION Total dissolved-solids concentration, in milligrams per liter, and U.S. Geological Survey salinity classification Less than 1,000; fresh 1,000–3,000; slightly saline 3,000–10,000; moderately saline 10,000–35,000; very saline More than 35,000; briny

Appendix 2. Trilinear diagrams showing major-ion composition and dissolved-solids concentrations for environmental groundwater samples, Cenozoic and Mesozoic geologic units, Greater Green River Basin.

10-42 100 100 E. Laney Shale Member of F. Wilkins Peak Member of 100 100 80 80 Green River Formation Calcium plus Magnesium Green River Formation Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 0 20 40 60 20 40 60 80 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

100 100 G. Tipton Shale Member of H. Wasatch Formation 100 100 80 80 Green River Formation Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 40 60 80 0 20 40 60 100 80 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

Appendix 2. T rilinear diagrams showing major-ion composition and dissolved-solids concentrations for environmental groundwater samples, Cenozoic and Mesozoic geologic units, Greater Green River Basin.—Continued

10-43 100 100 I. Cathedral Bluffs Tongue J. Farson Sandstone 100 100 80 80 of the Wasatch Formation Calcium plus Magnesium Member of the Green Calcium plus Magnesium

80 River Formation and 80 60 Alkali Creek Member 60 60 of the Wasatch 60 40 40 Formation 40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 100 0 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 0 20 40 60 80 40 60 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

100 100

K. LaBarge Member of 100 L. Battle Spring Formation 100 80 80 the Wasatch Formation Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 0 20 40 60 80 40 60 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

10-44 100 100 M. Fort Union Formation N. Mesaverde Formation 100 100 80 80 Calcium plus Magnesium or Group Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 40 60 80 0 20 40 60 100 80 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

10-45 10-46 Appendix 3 Trilinear diagrams, produced water samples, major-ion composition and TDS

10-47 100 100 A. Wasatch Formation B. Almy Formation 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 0 20 40 60 20 40 60 80 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

100 C. Fort Union Formation 100 80 Calcium plus Magnesium

80 60

60 40

Sulfate 20 plus Chloride

20 0 EXPLANATION Percent

0 0 Total dissolved-solids concentration, in milligrams per liter,

Percent 0 and U.S. Geological Survey salinity classification 20 0 Less than 1,000; fresh 20 1,000–3,000; slightly saline 100 0 40 100 20 Sodium plus Potassium 3,000–10,000; moderately saline 40 20 80 60 80 10,000–35,000; very saline 40 Sulfate More than 35,000; briny 60 40 60 80 60 60

Magnesium 80 60 40 100 40 80

Carbonate plus Bicarbonate 80 100 20 100 20

0 100 80 60 40 20 0 100 0

0 20 40 60 80 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent

Appendix 3a. Trilinear diagrams showing major-ion composition and dissolved-solids concentrations for produced groundwater samples from aquifers in Cenozoic hydrogeologic units, Greater Green River Basin.

10-48 100 100 A. Lance Formation B. Almond Formation 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 0 20 40 60 20 40 60 80 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

100 100 C. Ericson Sandstone D. Frontier Formation 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 40 100 100 0 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 20 40 60 80 0 20 40 60 100 80 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

Appendix 3b. Trilinear diagrams showing major-ion composition and dissolved-solids concentrations for produced groundwater samples from aquifers in Mesozoic hydrogeologic units, Greater Green River Basin.

10-49 100 100 E. Cloverly Formation F. Nugget Sandstone 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 20 80 100 20 20 100 20 100

0 100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 0 20 40 60 20 40 60 80 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

10-50 100 100 A. Tensleep Sandstone B. Madison Limestone 100 100 80 80 Calcium plus Magnesium Calcium plus Magnesium

80 80 60 60

60 60 40 40

40 40

Sulfate 20 plus Chloride Sulfate 20 plus Chloride

20 20

0 0 Percent Percent

0 0 0 0

Percent Percent 0 0

20 20 0 0

20 20 0 100 0 40 100 100 40 100 20 20 Sodium plus Potassium Sodium plus Potassium

40 40 20 20 80 60 80 80 60 80 40 40 Sulfate Sulfate 60 60 40 40 60 80 60 60 80 60 60 60

Magnesium Magnesium 80 80 60 60 40 100 40 40 100 40 80 80

Carbonate plus Bicarbonate Carbonate plus Bicarbonate 80 100 80 100 20 100 20 20 100 20

100 80 60 40 20 0 100 0 0 100 80 60 40 20 0 100 0

0 0 20 40 60 20 40 60 80 80 100 100 Calcium Chloride, Fluoride, Nitrite plus Nitrate Calcium Chloride, Fluoride, Nitrite plus Nitrate

Percent Percent

Appendix 3c. Trilinear diagrams showing major-ion composition and dissolved-solids concentrations for produced groundwater samples from aquifers in Paleozoic hydrogeologic units, Greater Green River Basin.

10-51 10-52 Appendix 4 Summary statistics for environmental water samples, Wyoming Greater Green River Basin

10-53 Appendix 4a 1

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter; µS/cm, microsiemens per centimeter at 25 degrees Celsius; CaCO3, calcium carbonate; N, nitrogen; P, phosphorus]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units: Quaternary Period Alluvium pH (standard units) 6.7 7.4 7.7 8.0 9.4 47 Specific conductance 235 549 932 1,583 16,400 52 (µS/cm)

Hardness (as CaCO3) 3 96 280 520 2,800 41 Calcium 0.8 30.5 66.6 98.5 325 43 Magnesium 0.2 8.6 23.5 44.5 474 42 Potassium 0.10 1.10 1.70 2.50 18 33 Sodium-adsorption ratio 0.2 0.6 2.4 12 51 34 (unitless) Sodium 7.1 19 89.5 250 2,820 34

Alkalinity (as CaCO3) 66 192 278 349 2,160 42 Chloride 2.8 6.8 21.5 55.2 270 42 Fluoride 0.1 0.3 0.4 1.0 3.6 39 Silica 4.3 8.4 12 18 60.9 41 Sulfate 8 57 120 416 4,910 43 Dissolved solids 148 344 494 1,030 9,810 42 Ammonia (as N) -- 0.016 0.035 0.050 -- 25 Nitrate+nitrite (as N) -- 0.023 0.130 0.920 -- 33 Nitrate (as N) -- 0.070 0.140 1.205 -- 17 Nitrite (as N) -- 0.0001 0.001 0.006 -- 23 Orthophosphate (as P) -- 0.005 0.011 0.020 -- 30 Antimony -- 0.98 1.11 3.55 -- 3 Arsenic -- 17.1 18 40.8 -- 3 Barium -- 13 24 103 -- 3 Boron -- 40 75 852 -- 16 Cadmium -- 0.07 0.50 1.21 -- 3 Chromium -- 1.1 2.3 4.2 -- 3 Cobalt -- 1.19 1.93 2.73 -- 3 Copper -- 15.2 22.2 68.9 -- 3 Iron -- 3.2 10.3 32.8 -- 22 Lithium -- 39.6 70.9 415 -- 3 Manganese -- 0.7 3.4 20.8 -- 22 Molybdenum -- 13 184 395 -- 3 Nickel -- 14 14.9 50.4 -- 3 Selenium -- 2.7 13.1 116 -- 5 Strontium -- 1,530 4,330 11,400 -- 3 Vanadium -- 6 6.4 15 -- 3 Zinc -- 3 9 17 -- 3

10-54 2 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Alluvium— Radon-222 (picocuries -- 410 460 760 -- 3 continued per liter) Uranium -- 2.74 23.0 86 -- 4

Landslide deposits pH (standard units) 7.3 7.6 7.8 8.0 8.5 4 Specific conductance 350 373 410 490 640 4 (µS/cm)

Hardness (as CaCO3) 190 200 200 230 330 4 Calcium 52 52 58.5 67.5 75 4 Magnesium 10 13 15 20.8 35 4 Potassium 1.60 1.90 2.85 4.45 6.70 4 Sodium-adsorption ratio 0.1 0.2 0.3 0.4 0.4 4 (unitless) Sodium 4.6 6.4 9.5 13 16 4

Alkalinity (as CaCO3) 160 175 195 238 320 4 Chloride 4.5 5.2 12.2 21 27 4 Fluoride 0.1 0.2 0.3 0.4 0.5 4 Silica 11 19.2 23.5 26 29 4 Sulfate 3.9 5.9 8.1 13.9 27 4 Dissolved solids 220 235 246 284 383 4 Nitrate+nitrite (as N) -- 0.055 0.310 1.758 -- 4 Phosphorus (as P) -- 0.010 0.015 0.028 -- 4 Boron -- 30 35 78 -- 4 Manganese -- 4 4 7 -- 4

Dune sand pH (standard units) 7.5 ------10.2 2 deposits Specific conductance 580 ------1,350 2 (µS/cm)

Hardness (as CaCO3) 180 ------200 2 Calcium 14 ------51 2 Magnesium 17 ------34 2 Potassium 3.50 ------18 2 Sodium-adsorption ratio 1.5 ------11 2 (unitless) Sodium 47 ------330 2

Alkalinity (as CaCO3) 235 ------800 2 Chloride 3.7 ------23 2 Fluoride 0.5 ------1.3 2 Silica 16 ------20 2 Sulfate 62 ------88 2 Dissolved solids 346 ------1,010 2

10-55 Appendix 4a 3

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Undifferentiated pH (standard units) 7.5 ------1 Quaternary Specific conductance 2,220 ------1 rocks (µS/cm) (Holocene) Hardness (as CaCO3) 410 ------1 Calcium 64 ------1 Magnesium 61 ------1

Alkalinity (as CaCO3) 673 ------1 Chloride 72 ------1 Fluoride 1.7 ------1 Silica 19 ------1 Sulfate 490 ------1 Dissolved solids 1,510 ------1

Undifferentiated pH (standard units) 7.7 -- 7.70 -- 8.40 3 Quaternary Specific conductance 425 -- 460 -- 650 3 rocks (µS/cm)

Hardness (as CaCO3) 200 -- 220 -- 370 3 Calcium 35 -- 40 -- 54 3 Magnesium 28 -- 29 -- 56 3 Potassium 1.30 -- 2.40 -- 2.90 3 Sodium-adsorption ratio 0.3 -- 0.40 -- 0.50 3 (unitless) Sodium 15 -- 15 -- 16 3

Alkalinity (as CaCO3) 170 -- 190 -- 310 3 Chloride 10 -- 16 -- 29 3 Fluoride 0.3 -- 0.6 -- 0.8 3 Silica 10 -- 11 -- 14 3 Sulfate 32 -- 34 -- 41 3 Dissolved solids 253 -- 266 -- 390 3 Nitrate+nitrite (as N) -- 0.11 1.3 1.8 -- 3

10-56 4 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Glacial deposits pH (standard units) 7.9 ------1 Specific conductance 240 ------1 (µS/cm)

Hardness (as CaCO3) 90 ------1 Calcium 31 ------1 Magnesium 2.9 ------1

Alkalinity (as CaCO3) 118 ------1 Chloride 1 ------1 Silica 15 ------1 Sulfate 5.4 ------1 Dissolved solids 145 ------1

Terrace gravel pH (standard units) 7.4 7.6 7.6 7.9 9.5 12 deposits (Holo- Specific conductance 312 405 699 1,140 3,850 12 cene) (µS/cm)

Hardness (as CaCO3) 130 170 220 330 980 11 Calcium 30 41.5 55 75 160 11 Magnesium 10 14 25 33 140 11 Potassium 0.10 0.83 1.35 2.08 5.20 10 Sodium-adsorption ratio 0.1 0.4 2.4 3.5 11 10 (unitless) Sodium 3.5 11.5 74.5 148 500 10

Alkalinity (as CaCO3) 160 201 255 301 466 11 Chloride 2 8.4 24 57 730 11 Fluoride 0.1 0.2 0.6 1.0 2 10 Silica 6.3 13 17 27.5 64 11 Sulfate 5.2 15 92 165 700 11 Dissolved solids 201 302 492 776 2,460 11 Nitrate+nitrite (as N) -- 0.355 0.430 0.873 -- 4 Nitrate (as N) -- 0.110 0.450 3.200 -- 7 Boron -- 48 200 555 -- 8

10-57 Appendix 4a 5

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Terrace gravel pH (standard units) 7.9 ------1 deposits Specific conductance 178 ------1 (Pleistocene) (µS/cm)

Hardness (as CaCO3) 52 ------1 Calcium 21 ------1 Potassium 0.20 ------1 Sodium-adsorption ratio 1.3 ------1 (unitless) Sodium 21 ------1

Alkalinity (as CaCO3) 85 ------1 Chloride 0.9 ------1 Fluoride 0.2 ------1 Silica 13 ------1 Sulfate 11 ------1 Dissolved solids 118 ------1

Cenozoic hydrogeologic units: Tertiary Period Bishop Conglom- pH (standard units) 7.2 7.6 7.7 7.8 7.9 6 erate Specific conductance 95 291 410 713 840 6 (µS/cm)

Hardness (as CaCO3) 40 130 200 380 440 6 Calcium 12 36.5 55 97.5 110 6 Magnesium 2.4 9.1 14.9 32 39 6 Potassium 0.90 1.23 2.30 2.78 5.30 6 Sodium-adsorption ratio 0.2 0.2 0.2 0.3 0.6 6 (unitless) Sodium 2.7 5.1 9.2 11.3 31 6

Alkalinity (as CaCO3) 26 111 165 215 236 6 Chloride 1.7 2.7 4.2 11.0 22 6 Fluoride 0.1 0.4 0.6 0.6 0.7 6 Silica 12 16 17.5 21.2 24 6 Sulfate 11 20 36 155 240 6 Dissolved solids 70 167 252 465 594 6 Nitrate+nitrite (as N) -- 0.210 0.390 1.615 -- 5 Orthophosphate (as P) -- 0.010 0.020 0.035 -- 5 Phosphorus (as P) -- 0.008 0.010 0.020 -- 5 Boron -- 16 35 82 -- 6 Iron -- 16.9 40 115 -- 5

10-58 6 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Bridger Formation pH (standard units) 6.8 7.6 7.8 8.2 9.5 23 Specific conductance 335 644 1,200 1,620 6,810 23 (µS/cm)

Hardness (as CaCO3) 2 58 240 340 2,900 23 Calcium 0.6 15 66 81 500 23 Magnesium 0.2 4.9 16.8 36.5 390 23 Potassium 0.50 1.10 1.90 4 31 21 Sodium-adsorption ratio 0.2 0.5 2.9 18 180 21 (unitless) Sodium 8.3 18 150 290 1,500 21

Alkalinity (as CaCO3) 39 247 290 346 942 23 Bromide 0.02 ------1 Chloride 2.6 18 35 66 1,700 23 Fluoride 0.1 0.4 1.0 1.8 8.4 22 Silica 6.8 11.5 18 25.5 53 23 Sulfate 1.3 18.4 92 370 2,700 23 Dissolved solids 213 399 811 1,100 4,380 23 Ammonia (as N) -- 0.011 0.040 0.285 -- 13 Nitrate+nitrite (as N) -- 0.017 0.042 0.100 -- 15 Nitrate (as N) -- 0.240 0.450 0.780 -- 9 Orthophosphate (as P) -- 0.007 0.013 0.023 -- 14 Phosphorus (as P) -- 0.010 0.020 0.035 -- 9 Boron -- 48 380 835 -- 18 Iron -- 11.2 35 235 -- 14 Manganese -- 4.1 12.1 20 -- 14 Strontium -- 140 902 1,070 -- 3 Radium-226 -- 0.065 0.310 0.593 -- 4 (radon method) (picocuries per liter) Uranium -- 0.82 2.60 25 -- 7

10-59 Appendix 4a 7

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Green River pH (standard units) 8 -- 8.2 -- 10.3 3 Formation Specific conductance 2,390 -- 2,510 -- 10,200 3 (µS/cm)

Hardness (as CaCO3) 7 -- 20 -- 21 3 Calcium 5.2 ------5.6 2 Magnesium 1.7 -- 1.7 -- 1.8 3 Potassium 6.60 ------1 Sodium-adsorption ratio 460 ------1 (unitless) Sodium 2,970 ------1

Alkalinity (as CaCO3) 263 ------267 2 Chloride 24 -- 29 -- 113 3 Fluoride 1.1 ------1.9 2 Silica 4.6 ------5.6 2 Sulfate 189 -- 900 -- 940 3 Dissolved solids 1,650 -- 1,730 -- 6,960 3

Laney Member of pH (standard units) 7.3 7.7 8 8.4 10.4 47 the Green River Specific conductance 440 1,200 1,900 4,360 53,600 47 Formation (µS/cm)

Hardness (as CaCO3) 2 100 290 680 18,000 47 Calcium 0.5 38.3 68.7 175 470 42 Magnesium 0.2 7.2 32 75.8 4,200 46 Potassium 0.50 1.08 1.84 3.18 390 44 Sodium-adsorption ratio 0.8 3.0 9.0 33.2 2,400 44 (unitless) Sodium 23 130 290 680 25,000 45

Alkalinity (as CaCO3) 110 211 271 438 47,000 47 Chloride 3.7 19.5 41.4 76.8 10,000 48 Fluoride 0.2 0.4 1 1.8 110 46 Silica 5.5 10.8 13.2 18 180 46 Sulfate 5.2 171 455 1,600 64,000 48 Dissolved solids 241 840 1,260 4,000 99,400 50 Ammonia (as N) -- 0.012 0.032 0.085 -- 13 Nitrate+nitrite (as N) -- 0.066 0.410 1.600 -- 31 Nitrate (as N) -- 0.150 0.500 4.575 -- 8 Nitrite (as N) -- 0.006 0.007 0.008 -- 5 Orthophosphate (as P) -- 0.005 0.012 0.030 -- 28 Phosphorus (as P) -- 0.010 0.010 0.020 -- 11 Antimony -- 0.09 0.12 0.15 -- 3

10-60 8 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Laney Member of Arsenic -- 1.1 2 4 -- 5 the Green River Barium -- 16.9 30.3 54.3 -- 4 Formation— continued Boron -- 140 453 920 -- 37 Cobalt -- 0.15 0.26 1.24 -- 3 Copper -- 2.3 3.4 4.9 -- 5 Iron -- 20 40 75 -- 29 Lithium -- 8.5 16.0 92.7 -- 4 Manganese -- 2.5 14.0 75 -- 29 Molybdenum -- 2.9 3.3 4.8 -- 4 Nickel -- 0.51 0.68 1.26 -- 3 Selenium -- 0.6 0.9 1.4 -- 7 Strontium -- 353 894 1,290 -- 3 Vanadium -- 0.9 2.4 4.2 -- 4 Zinc -- 2 6 18 -- 5 Radium-226 -- 0.08 0.10 0.14 -- 3 (radon method) (picocuries per liter) Radon-222 (picocuries -- 750 880 1,360 -- 3 per liter) Uranium -- 4.30 12.80 15.20 -- 7

Wilkins Peak pH (standard units) 7.4 7.6 7.6 8.2 9.9 9 Member of Specific conductance 580 1,000 1,320 2,400 5,000 9 Green River (µS/cm) Formation

Hardness (as CaCO3) 8 250 340 540 570 9 Calcium 1.3 37 81 100 120 9 Magnesium 1 33 38 71 81.1 9 Potassium 0.90 1.20 1.40 1.66 3.30 9 Sodium-adsorption ratio 0.5 0.8 2.1 16 140 9 (unitless) Sodium 19 43 110 570 1,100 9

Alkalinity (as CaCO3) 238 287 347 673 1,890 9 Bromide 0.21 ------1 Chloride 3 8.4 16 140 330 9 Fluoride 0.3 0.4 0.7 2.8 7.1 9 Silica 8.2 15 24 30 32.4 9 Sulfate 80 200 280 490 656 9 Dissolved solids 388 682 987 1,860 2,780 9 Nitrate+nitrite (as N) -- 0.368 1.650 1.975 -- 8

10-61 Appendix 4a 9

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Wilkins Peak Orthophosphate (as P) -- 0.030 0.035 0.040 -- 8 Member of Phosphorus (as P) -- 0.010 0.020 0.020 -- 7 Green River Formation— Boron -- 40 190 1,220 -- 8 continued Iron -- 15.0 30 45 -- 9

Tipton Shale pH (standard units) 7.6 8.2 9.5 9.5 9.8 7 Member of the Specific conductance 23 570 1,120 1,540 2,050 8 Green River (µS/cm) Formation Hardness (as CaCO3) 3 4 7 210 570 9 Calcium 0.7 1.3 2 48 110 9 Magnesium 0.1 0.3 0.6 22 94 9 Potassium 0.60 0.90 1.10 1.30 1.80 9 Sodium-adsorption ratio 0.8 3.70 40 53 110 9 (unitless) Sodium 28 220 250 280 510 9

Alkalinity (as CaCO3) 250 322 365 530 929 9 Chloride 1.4 2.4 21 27 73 9 Fluoride 0.1 1 6.1 7.3 15 9 Silica 8.8 9.5 12 18 26 9 Sulfate 23 44 97 160 640 9 Dissolved solids 298 622 685 906 1,370 9 Nitrate+nitrite (as N) -- 0.020 0.040 0.130 -- 7 Orthophosphate (as P) -- 0.010 0.020 0.030 -- 7 Phosphorus (as P) -- 0.010 0.020 0.060 -- 3 Boron -- 152 630 1,210 -- 8 Iron -- 20 80 120 -- 7

Wasatch pH (standard units) 6.8 8.2 9.1 9.5 10.4 315 Formation Specific conductance 118 527 706 1,100 14,200 320 (µS/cm)

Hardness (as CaCO3) 2 6 62 260 2,400 82 Calcium 0.3 1.1 2.4 20.8 530 306 Magnesium 0.1 0.7 3.3 13.8 250 161 Potassium 0.40 0.70 0.90 1.90 410 219 Sodium-adsorption ratio 0.1 8.8 29 36 140 298 (unitless) Sodium 2.3 107 138 219 2,500 307

Alkalinity (as CaCO3) 62 165 200 242 1,670 306 Bromide 0.04 ------1 Chloride 0.7 7.4 16 36 3,300 295

10-62 10 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Wasatch Fluoride 0.1 0.5 1.6 4.7 18 296 Formation— Silica 2.3 8.4 10 12 34 80 continued Sulfate 1 15 70 196 3,900 303 Dissolved solids 126 287 377 650 9,710 315 Ammonia (as N) -- 0.004 0.012 0.040 -- 15 Nitrate+nitrite (as N) -- 0.035 0.078 0.173 -- 52 Nitrate (as N) -- 0.055 0.160 0.298 -- 12 Orthophosphate (as P) -- 0.010 0.017 0.030 -- 44 Phosphorus (as P) -- 0.006 0.010 0.020 -- 19 Arsenic -- 0.43 1.5 19.8 -- 4 Boron -- 82 201 525 -- 66 Iron -- 20 30 70 -- 42 Manganese -- 0.8 2.8 9.5 -- 41 Strontium -- 23 40 546 -- 3 Zinc -- 3 7 14 -- 4 Radium-226 -- 0.090 0.090 0.100 -- 3 (radon method) (picocuries per liter) Radon-222 (picocuries -- 608 760 1,180 -- 6 per liter) Uranium -- 0.47 0.90 4.12 -- 6

Cathedral Bluffs pH (standard units) 9.1 9.2 9.3 9.4 9.7 8 Tongue of the Specific conductance 750 945 1,180 1,610 1,800 8 Wasatch (µS/cm) Formation Hardness (as CaCO3) 2 3.5 4 5.5 9 7 Calcium 0.5 0.9 1 1.6 2.6 7 Magnesium 0.3 0.3 0.3 0.4 0.5 8 Potassium 0.39 0.78 0.90 1 1.30 8 Sodium-adsorption ratio 38 49 51 72 100 8 (unitless) Sodium 170 215 265 320 390 8

Alkalinity (as CaCO3) 262 337 429 579 697 7 Chloride 13 23 27.5 45.5 80 8 Fluoride 2.6 5.8 6.6 10.4 14 7 Silica 2 7.6 10 10 11 7 Sulfate 13 49.5 96.5 138 370 8 Dissolved solids 439 557 691 920 924 8 Nitrate+nitrite (as N) -- 0.013 0.018 0.025 -- 7 Orthophosphate (as P) -- 0.025 0.040 0.073 -- 6 Boron -- 390 520 1,600 -- 7 Iron -- 27.5 40 77.5 -- 6

10-63 Appendix 4a 11

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Farson Sandstone- pH (standard units) 6.2 7.6 8.2 9.2 9.5 16 Alkali Creek Specific conductance 223 354 660 1,120 2,280 16 Member of the (µS/cm) Green River and Wasatch Hardness (as CaCO3) 2 3 79 150 430 9 Formations Calcium 0.8 1.5 20 39.2 94 10 Magnesium 0.1 0.2 7 12.1 48 10 Potassium 0.60 0.90 1.45 2 2.60 10 Sodium-adsorption ratio 0.2 0.9 3.9 32 95 9 (unitless) Sodium 6 34.8 165 278 510 10

Alkalinity (as CaCO3) 86 155 245 418 620 10 Chloride 1 6.3 14 23 72 9 Fluoride 0.1 0.2 0.5 3.4 11 14 Silica 4.5 8.4 9.2 12 15 9 Sulfate 0.7 6.1 135 206 670 10 Dissolved solids 168 224 457 706 1,550 13 Ammonia (as N) -- 0.064 0.135 0.178 -- 6 Boron -- 170 277 453 -- 5 Iron -- 14.8 27 60.5 -- 5 Manganese -- 4.5 5.4 6.6 -- 5 Molybdenum -- 2.5 4 10.8 -- 4 Strontium -- 23.5 40.5 351 -- 4 Zinc -- 6 10 16 -- 5

LaBarge Member pH (standard units) 7.5 8 8.6 9.0 9.6 22 of the Wasatch Specific conductance 315 477 810 1,110 4,420 22 Formation (µS/cm)

Hardness (as CaCO3) 3 14 140 210 500 17 Calcium 0.9 3.7 13 55 130 19 Magnesium 0.1 0.8 3.7 23 42 18 Potassium 0.20 0.58 0.95 1.15 2.60 16 Sodium-adsorption ratio 0.10 0.3 6 25 65 15 (unitless) Sodium 4.9 10 110 193 390 17

Alkalinity (as CaCO3) 66 160 218 335 490 20 Chloride 2.7 5.9 8.6 17 180 20 Fluoride 0.1 0.3 0.4 1.0 2.7 20 Silica 3 7.0 8.7 10.4 14 19 Sulfate 8.8 77.5 110 140 1,800 20

10-64 12 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size LaBarge Member Dissolved solids 179 289 463 689 3,160 22 of the Wasatch Nitrate+nitrite (as N) -- 0.055 0.110 0.145 -- 12 Formation— continued Nitrate (as N) -- 0.022 0.102 0.469 -- 4 Iron -- 18.5 30 55 -- 4

Chappo Member pH (standard units) 7.7 ------1 of the Wasatch Specific conductance 760 ------1 Formation (µS/cm)

Hardness (as CaCO3) 310 ------1 Calcium 68 ------1 Magnesium 35 ------1 Potassium 1.50 ------1 Sodium-adsorption ratio 1.1 ------1 (unitless) Sodium 43 ------1

Alkalinity (as CaCO3) 340 ------1 Chloride 43 ------1 Fluoride 0.4 ------1 Silica 11 ------1 Sulfate 26 ------1 Dissolved solids 431 ------1

Undifferentiated pH (standard units) 7.7 ------1 Eocene rocks Specific conductance 4,120 ------1 (µS/cm)

Hardness (as CaCO3) 520 ------1 Calcium 73 ------1 Magnesium 81 ------1 Potassium 2.60 ------1 Sodium-adsorption ratio 15 ------1 (unitless) Sodium 760 ------1

Alkalinity (as CaCO3) 512 ------1 Chloride 60 ------1 Fluoride 2.3 ------1 Silica 22 ------1 Sulfate 1,700 ------1 Dissolved solids 3,010 ------1

10-65 Appendix 4a 13

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Pass Peak Con- pH (standard units) 7.9 ------1 glomerate Specific conductance 715 ------1 (µS/cm) Fluoride 0.1 ------1 Dissolved solids 399 ------1

Fort Union pH (standard units) 7.2 ------9.7 2 Formation Specific conductance 876 ------2,020 2 (µS/cm)

Hardness (as CaCO3) 49 ------460 2 Calcium 0.1 ------120 2 Magnesium 12 ------38.6 2 Potassium 0.70 ------2.38 2 Sodium-adsorption ratio 0.5 ------30 2 (unitless) Sodium 23.5 ------480 2

Alkalinity (as CaCO3) 282 ------710 2 Bromide 0.08 ------1 Chloride 13 ------15.3 2 Fluoride 0.3 ------3.3 2 Silica 9.9 ------15.7 2 Sulfate 196 ------370 2 Dissolved solids 618 ------1,320 2

Mesozoic hydrogeologic units Mesaverde pH (standard units) 7.6 -- 7.9 -- 8.2 3 Formation or Specific conductance 687 -- 2290 -- 3,360 3 Group (µS/cm)

Hardness (as CaCO3) 160 -- 330 -- 660 3 Calcium 39 -- 70 -- 120 3 Magnesium 16 -- 37 -- 87 3

Alkalinity (as CaCO3) 94 -- 223 -- 354 3 Chloride 9 -- 30 -- 40 3 Fluoride 0.4 ------2 2 Silica 11 -- 12 -- 14 3 Sulfate 159 -- 930 -- 1,520 3 Dissolved solids 437 -- 1,740 -- 2,400 3 Nitrate (as N) -- 0.140 0.160 0.320 -- 3

10-66 14 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Almond pH (standard units) 6.3 ------7.4 2 Formation Specific conductance 398 ------508 2 of the (µS/cm) Mesaverde Group Hardness (as CaCO3) 150 ------180 2 Calcium 35 ------37 2 Magnesium 15 ------22 2 Potassium 7.70 ------9.90 2 Sodium-adsorption ratio 0.9 ------1 2 (unitless) Sodium 25 ------31 2

Alkalinity (as CaCO3) 77 ------197 2 Chloride 5.5 ------15 2 Fluoride 0.3 ------0.8 2 Silica 8.9 ------11 2 Sulfate 9.1 ------150 2 Dissolved solids 231 ------329 2

Ericson Sandstone pH (standard units) 6.3 6.6 7.0 7.6 8 4 of the Mesa- Specific conductance 620 -- 900 -- 1,950 3 verde Group (µS/cm)

Hardness (as CaCO3) 150 190 210 220 230 4 Calcium 2.8 34 43 45 64 5 Magnesium 1.9 16 17 21 28 5 Potassium 5.90 10 11 12 16 5 Sodium-adsorption ratio 2.8 ------11 2 (unitless) Sodium 31 32 78 380 380 5

Alkalinity (as CaCO3) 194 -- 380 -- 418 3 Chloride 17 18 42 210 370 5 Fluoride 0.6 -- 1.0 -- 1.2 3 Silica 10 -- 11 -- 14 3 Sulfate 69 98 116 190 250 5 Dissolved solids 382 395 446 964 1,210 5

Frontier pH (standard units) 7.3 ------1 Formation Specific conductance 1,470 ------1 (µS/cm)

Hardness (as CaCO3) 740 ------1 Calcium 192 ------1 Magnesium 64 ------1

10-67 Appendix 4a 15

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Frontier Sodium-adsorption ratio 1.1 ------1 Formation— (unitless) continued Sodium 68 ------1 Chloride 57 ------1 Silica 11 ------1 Sulfate 403 ------1

Bear River pH (standard units) 8.3 ------1 Formation Specific conductance 692 ------1 (µS/cm)

Hardness (as CaCO3) 46 ------1 Calcium 8.3 ------1 Magnesium 6.1 ------1 Potassium 1.60 ------1 Sodium-adsorption ratio 9.6 ------1 (unitless) Sodium 150 ------1

Alkalinity (as CaCO3) 291 ------1 Chloride 12 ------1 Fluoride 0.5 ------1 Silica 9 ------1 Sulfate 68 ------1 Dissolved solids 436 ------1

Gannett Group pH (standard units) 8.3 ------1 Specific conductance 396 ------1 (µS/cm)

Hardness (as CaCO3) 70 ------1 Calcium 17 ------1 Magnesium 6.6 ------1 Potassium 0.60 ------1 Sodium-adsorption ratio 3.1 ------1 (unitless) Sodium 60 ------1

Alkalinity (as CaCO3) 182 ------1 Chloride 13 ------1 Fluoride 0.3 ------1 Silica 8.2 ------1 Sulfate 12 ------1 Dissolved solids 226 ------1

10-68 16 Appendix 4a

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Paleozoic hydrogeologic units Nugget Sandstone pH (standard units) 7.8 ------7.8 2 Specific conductance 299 ------376 2 (µS/cm)

Hardness (as CaCO3) 150 ------180 2 Calcium 50 ------57 2 Magnesium 5.8 ------9.1 2 Potassium 0.80 ------1 2 Sodium-adsorption ratio 0.1 ------0.3 2 (unitless) Sodium 3.6 ------8.6 2

Alkalinity (as CaCO3) 153 ------179 2 Chloride 2.5 ------11 2 Fluoride 0.1 ------0.1 2 Silica 8 ------13 2 Sulfate 3.2 ------9.2 2 Dissolved solids 172 ------209 2

Thaynes Lime- pH (standard units) 7.9 ------1 stone Specific conductance 535 ------1 (µS/cm)

Bighorn Dolomite pH (standard units) 7.2 ------1 Specific conductance 500 ------1 (µS/cm)

Hardness (as CaCO3) 270 ------1 Calcium 59 ------1 Magnesium 30 ------1 Potassium 1.30 ------1 Sodium-adsorption ratio 0.2 ------1 (unitless) Sodium 6.9 ------1

Alkalinity (as CaCO3) 230 ------1 Chloride 10 ------1 Fluoride 0.1 ------1 Silica 8.3 ------1 Sulfate 33 ------1 Dissolved solids 287 ------1

10-69 Appendix 4a 17

Appendix 4a. Summary statistics for environmental water samples, Green River Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Precambrian hydrogeologic units Undifferentiated pH (standard units) 9.3 ------1 Precambrian Specific conductance 447 ------1 rocks (µS/cm)

Hardness (as CaCO3) 7 ------1 Calcium 2.4 ------1 Magnesium 0.2 ------1 Potassium 1.20 ------1 Sodium-adsorption ratio 15 ------1 (unitless) Sodium 91 ------1

Alkalinity (as CaCO3) 51 ------1 Chloride 70 ------1 Fluoride 14 ------1 Silica 49 ------1 Sulfate 14 ------1 Dissolved solids 272 ------1

10-70 Appendix 4b 1

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units: Quaternary Period Alluvium pH (standard units) 6.9 7.1 7.3 7.4 7.8 17 Specific conductance 415 650 1,080 2,500 29,000 17 (µS/cm)

Hardness (as CaCO3) 140 240 290 510 9,000 15 Calcium 31 65.8 69.5 138 743 14 Magnesium 8.9 16 37.3 53 1,740 14 Potassium 1 1.38 7.36 10.38 35 8 Sodium-adsorption ratio 0.2 0.3 3.2 6.8 76 8 (unitless) Sodium 6.9 10.7 162 487 16,500 8

Alkalinity (as CaCO3) 175 228 381 468 533 13 Chloride 2 4.8 13 41.5 25,000 15 Fluoride 0.2 0.34 0.5 0.6 6.5 11 Silica 6.70 10.8 16.5 19.5 2,000 12 Sulfate 7.7 78.8 220 512 8,880 14 Dissolved solids 193 355 737 1,490 59,000 14 Nitrate+nitrite (as N) -- 0.071 0.360 1.600 -- 7 Nitrate (as N) -- 0.170 0.370 0.523 -- 10 Orthophosphate (as P) -- 0.010 0.040 0.080 -- 3 Boron -- 80 160 300 -- 9 Iron -- 400 471 2,300 -- 3 Molybdenum -- 1.0 1.5 2.2 -- 4

Landslide deposits pH (standard units) 7.4 7.5 7.6 7.7 8.3 6 Specific conductance 485 523 550 683 850 6 (µS/cm)

Hardness (as CaCO3) 180 250 280 320 330 6 Calcium 33 52.3 61.5 78.3 91 6 Magnesium 14 24 26.5 33.5 40 6 Potassium 0.60 1.05 1.40 1.75 1.80 6 Sodium-adsorption ratio 0.1 0.7 1.1 1.2 1.8 6 (unitless) Sodium 4.8 25.3 38.5 48 72 6

Alkalinity (as CaCO3) 218 237 275 313 386 6 Chloride 3.9 4.6 6.7 6.9 8.1 6 Fluoride 0.1 0.2 0.2 0.2 0.3 6 Silica 17 18.2 23.5 25 28 6

10-71 2 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Landslide Sulfate 8.5 29.8 47.5 88.5 150 6 deposits— Dissolved solids 269 317 421 473 482 6 continued Nitrate+nitrite (as N) -- 0.143 0.245 0.438 -- 6 Orthophosphate (as P) -- 0.010 0.025 0.065 -- 6 Phosphorus (as P) -- 0.010 0.015 0.180 -- 6 Boron -- 21 50 55 -- 6 Iron -- 6.3 11.6 30 -- 6

Dune sand pH (standard units) 7.4 7.6 7.7 7.9 7.9 5 deposits Specific conductance 388 436 483 654 1,660 5 (µS/cm)

Hardness (as CaCO3) 150 170 210 310 350 5 Calcium 27 44 51 51 84 5 Magnesium 11 21 21 34 48 5 Potassium 2.20 2.35 2.70 3.33 4.30 4 Sodium-adsorption ratio 0.7 0.8 0.8 2.4 7.2 4 (unitless) Sodium 23 23.8 24.5 91.3 290 4

Alkalinity (as CaCO3) 172 203 203 301 561 5 Chloride 0.5 2.2 2.2 6.5 42 5 Fluoride 0.2 0.3 0.4 0.8 1.3 5 Silica 10 17 18 18 20 5 Sulfate 23 28 47 67 290 5 Dissolved solids 227 259 292 399 1,080 5 Nitrate (as N) -- 0.110 0.360 0.465 -- 5 Boron -- 65 70 315 -- 5

Cenozoic hydrogeologic units: Tertiary Period Browns Park pH (standard units) 6.5 7.1 7.5 8.0 8.1 18 Formation Specific conductance 92 239 423 729 3,600 18 (µS/cm)

Hardness (as CaCO3) 36 110 180 300 1,400 18 Calcium 11 35.4 53 110 522 17 Magnesium 1.9 3.1 6.5 11 32.9 17 Potassium 0.36 1.40 2.60 4.47 8.42 17 Sodium-adsorption ratio 0.1 0.2 0.2 0.5 5.2 17 (unitless) Sodium 2 4.3 7.4 22 124 17

10-72 Appendix 4b 3

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Browns Park Alkalinity (as CaCO3) 38 103 167 210 287 17 Formation— Bromide 0.03 0.05 0.12 0.13 0.14 5 continued Chloride 0.9 1.4 3 4.8 38 18 Fluoride 0.1 0.2 0.3 0.3 0.5 17 Silica 0.1 15 28 37 52 17 Sulfate 3.8 11 27 147 1,230 17 Dissolved solids 84 171 262 398 2,740 17 Ammonia (as N) -- 0.002 0.010 0.100 -- 11 Nitrate+nitrite (as N) -- 0.020 0.058 0.280 -- 16 Nitrite (as N) -- 0.006 0.007 0.008 -- 5 Orthophosphate (as P) -- 0.013 0.020 0.038 -- 16 Phosphorus (as P) -- 0.030 0.050 0.100 -- 11 Arsenic -- 1.3 3.0 6.7 -- 6 Boron -- 8 16 50 -- 17 Cadmium -- 0.02 0.03 0.05 -- 5 Cobalt -- 0.09 0.28 0.65 -- 5 Copper -- 1.3 3.4 10.5 -- 5 Iron -- 5.4 30 80 -- 16 Lithium -- 14.4 63.9 78.4 -- 5 Manganese -- 1.4 11.1 150 -- 16 Molybdenum -- 3.5 7.8 18.6 -- 6 Nickel -- 0.72 3.21 10.9 -- 5 Selenium -- 0.23 0.5 1.7 -- 6 Strontium -- 171 608 1,680 -- 5 Zinc -- 2 15 469 -- 6 Radon-222 (picocuries -- 270 780 3,220 -- 5 per liter) Uranium -- 0.50 1.88 3.55 -- 8

Washakie pH (standard units) 7.5 7.8 8.2 8.7 9.5 10 Formation Specific conductance 707 921 1,240 1,540 2,300 10 (µS/cm)

Hardness (as CaCO3) 3 33 100 200 410 10 Calcium 0.8 8.8 22 43.3 86 10 Magnesium 0.2 2.1 11.5 22.3 47 10 Potassium 0.64 1.08 1.23 1.90 2.20 9 Sodium-adsorption ratio 3 5.9 12 30 93 9 (unitless) Sodium 130 170 190 381 470 9

10-73 4 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Washakie Alkalinity (as CaCO3) 221 257 280 455 521 10 Formation— Bromide 0.02 0.03 0.04 0.04 0.04 4 continued Chloride 3.0 5.4 6.5 9.3 14 10 Fluoride 0.2 0.3 0.3 1.0 1.6 9 Silica 10 11.5 14 14.8 20 10 Sulfate 150 212 284 377 740 10 Dissolved solids 469 578 816 1,050 1,520 10 Ammonia (as N) -- 0.060 0.155 0.240 -- 4 Nitrate+nitrite (as N) -- 0.057 0.080 0.150 -- 7 Nitrate (as N) -- 0.143 0.175 0.388 -- 4 Orthophosphate (as P) -- 0.020 0.030 0.040 -- 7 Aluminum -- 2 3 5 -- 6 Arsenic -- 1.2 4.6 6.9 -- 6 Barium -- 8.80 11.9 16.1 -- 6 Boron -- 55 80 168 -- 8 Cadmium -- 0.02 0.03 0.03 -- 4 Cobalt -- 0.01 0.02 0.25 -- 4 Copper -- 0.9 1.2 1.7 -- 6 Iron -- 6.7 20 50 -- 7 Lithium -- 18.6 42.7 50.5 -- 4 Manganese -- 0.5 1.9 7.2 -- 6 Molybdenum -- 10.3 17.1 22.2 -- 6 Nickel -- 0.05 0.19 0.66 -- 4 Selenium -- 0.2 0.6 2.9 -- 6 Strontium -- 29.6 69.3 121 -- 4 Vanadium -- 0.5 2.4 6.0 -- 4 Zinc -- 0.5 3 26 -- 5 Radon-222 (picocuries -- 398 550 882 -- 4 per liter) Uranium -- 0.60 1.07 5.06 -- 5

Laney Member of pH (standard units) 7 7.4 7.6 8.0 8.8 15 the Green River Specific conductance 900 1,300 2,990 3,880 8,000 14 Formation (µS/cm)

Hardness (as CaCO3) 37 200 270 530 2,000 15 Calcium 7.7 42 58 106 500 15 Magnesium 4.2 22 31 64 180 15 Potassium 1 1.73 2.21 3.15 5.60 14

10-74 Appendix 4b 5

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Laney Member of Sodium-adsorption ratio 2.7 4.6 7.0 26 86 14 the Green River (unitless) Formation— Sodium 110 152 370 820 2,100 14 continued Alkalinity (as CaCO3) 267 302 331 491 886 15 Bromide 0.06 ------0.07 2 Chloride 2.3 5.2 7.4 20.5 1,500 15 Fluoride 0.1 0.5 1.0 1.8 3.1 14 Silica 8.8 13 14 17 27.9 15 Sulfate 99 285 790 1,540 4,400 15 Dissolved solids 528 791 1,810 3,050 7,210 15 Nitrate+nitrite (as N) -- 0.025 0.053 0.195 -- 13 Orthophosphate (as P) -- 0.008 0.012 0.016 -- 13 Phosphorus (as P) -- 0.010 0.010 0.030 -- 11 Boron -- 70 182 360 -- 14 Iron -- 45 80 130 -- 13 Manganese -- 1.1 5.2 20 -- 13

Wilkins Peak pH (standard units) 7.4 7.6 7.7 7.7 7.7 5 Member of the Specific conductance 495 533 1,220 2,200 3,100 4 Green River (µS/cm) Formation Hardness (as CaCO3) 190 290 300 770 1,400 5 Calcium 34 36 60 110 200 5 Magnesium 26 35 52 120 210 5 Potassium 0.70 1.70 2.70 3.50 6.10 5 Sodium-adsorption ratio 0.3 1.4 2.7 3.5 4.5 5 (unitless) Sodium 11 44 140 170 380 5

Alkalinity (as CaCO3) 236 277 504 549 720 5 Chloride 3.9 4.3 18 22 39 5 Fluoride 0.1 0.3 0.3 0.4 0.4 5 Silica 12 13 17 18 18 5 Sulfate 19 40 140 500 1,300 5 Dissolved solids 311 316 714 1,270 2,590 5 Nitrate+nitrite (as N) -- 0.115 0.390 1.050 -- 5 Orthophosphate (as P) -- 0.015 0.020 0.030 -- 5 Phosphorus (as P) -- 0.008 0.010 0.020 -- 5 Boron -- 30 130 475 -- 5

10-75 6 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Tipton Shale pH (standard units) 7.60 7.80 7.95 8.32 8.90 6 Member of Specific conductance 850 995 1,200 2,215 5,520 6 Green River (µS/cm) Formation Hardness (as CaCO3) 14 255 420 450 540 6 Calcium 3 48.2 73 81.5 110 6 Magnesium 1.6 33.3 55 63.5 66 6 Potassium 1.55 2.14 2.48 3.30 6.40 6 Sodium-adsorption ratio 0.4 1.4 2.2 28 740 6 (unitless) Sodium 21 65 110 502 1,260 6

Alkalinity (as CaCO3) 134 215 280 387 422 6 Bromide 0.03 ------0.24 2 Chloride 2.5 8.3 23 45 118 6 Fluoride 0.2 0.3 0.6 1.0 1.2 6 Silica 9.32 11.5 15 15.8 16 6 Sulfate 230 232 330 704 2,580 6 Dissolved solids 568 642 850 1,520 4,200 6 Nitrate+nitrite (as N) -- 0.037 0.205 2 -- 6 Orthophosphate (as P) -- 0.009 0.010 0.025 -- 6 Boron -- 46.8 95 268 -- 6 Iron -- 14 20 56 -- 6 Manganese -- 6.2 10 20 -- 6

Wasatch pH (standard units) 6.80 7.52 8.20 8.50 9.20 42 Formation Specific conductance 270 1,140 1,670 2,443 5,200 42 (µS/cm)

Hardness (as CaCO3) 2 12 96 460 2,300 42 Calcium 0.5 3.3 24.5 73.9 435 42 Magnesium 0.1 1.1 7.5 40.1 296 42 Potassium 0.60 1.66 2.80 4.16 12.10 35 Sodium-adsorption ratio 0.30 5.4 19 44 83 31 (unitless) Sodium 17 188 310 485 1,200 35

Alkalinity (as CaCO3) 99 200 279 460 902 41 Bromide 0.03 0.06 0.12 0.17 0.44 11 Chloride 3.5 9 20 39 340 42 Fluoride 0.10 0.40 1.1 2.0 7.3 39 Silica 5.2 7.3 9.2 11 22 42

10-76 Appendix 4b 7

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Wasatch Sulfate 0.1 150 406 890 2,500 42 Formation— Dissolved solids 149 766 1,060 1,740 4,100 42 continued Ammonia (as N) -- 0.350 0.770 2.190 -- 11 Nitrate+nitrite (as N) -- 0.016 0.045 0.128 -- 20 Nitrate (as N) -- 0.178 0.440 0.905 -- 22 Nitrite -- 0.001 0.003 0.009 -- 15 Orthophosphate (as P) -- 0.008 0.019 0.030 -- 16 Phosphorus (as P) -- 0.013 0.060 0.215 -- 5 Aluminum -- 0.04 0.5 5.1 -- 12 Antimony -- 0.05 0.06 0.07 -- 15 Arsenic -- 0.1 0.2 0.6 -- 16 Barium -- 9.8 24.0 106 -- 15 Boron -- 55 99 170 -- 33 Cobalt -- 0.02 0.11 0.53 -- 11 Copper -- 0.5 1.8 6.8 -- 16 Iron -- 30.9 95 707 -- 22 Lithium -- 25.8 56.4 80.5 -- 11 Manganese -- 4.5 20 48.6 -- 21 Molybdenum -- 2.1 2.6 7.6 -- 11 Nickel -- 0.24 0.76 2.47 -- 15 Selenium -- 0.3 0.4 0.8 -- 15 Strontium -- 102 1,510 3,880 -- 11 Vanadium -- 0.2 0.4 1.9 -- 11 Zinc -- 1 4 20 -- 16 Alpha-radioactivity -- 0.30 1.45 15.5 -- 6 (picocuries per liter) Radon-222 (picocuries -- 260 390 2,170 -- 5 per liter) Uranium -- 0.06 0.16 0.5 -- 15

Cathedral Bluffs pH (standard units) 7.2 7.7 7.7 8.3 9.3 16 Tongue of Specific conductance 285 435 555 1,030 1940 15 the Wasatch (µS/cm) Formation Hardness (as CaCO3) 5 100 180 240 740 16 Calcium 1.4 25.5 36.5 54.1 197 16 Magnesium 0.4 8.2 20 24 58.5 16 Potassium 0.70 0.91 1.30 1.95 7.70 16 Sodium-adsorption ratio 0.3 0.9 1.0 5.6 61 16 (unitless) Sodium 7.7 25.5 32.5 134 462 16

10-77 8 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Cathedral Bluffs Alkalinity (as CaCO3) 134 200 259 290 533 16 Tongue of Bromide 0.02 0.02 0.03 0.04 0.09 5 the Wasatch Formation— Chloride 0.9 3.6 4.5 7.2 12 16 continued Fluoride 0.1 0.1 0.2 0.3 4.5 16 Silica 5.9 11.6 17.9 21 65.1 16 Sulfate 5.8 17.8 47 236.8 513 16 Dissolved solids 163 271 342 770 1,310 16 Ammonia (as N) -- 0.011 0.025 0.075 -- 6 Nitrate+nitrite (as N) -- 0.100 0.250 0.340 -- 15 Orthophosphate (as P) -- 0.014 0.030 0.040 -- 15 Phosphorus (as P) -- 0.020 0.030 0.033 -- 10 Arsenic -- 0.3 0.6 1.0 -- 6 Barium -- 12 20 60 -- 5 Boron -- 18 50 80 -- 15 Cadmium -- 0.02 0.02 0.03 -- 5 Cobalt -- 0.06 0.14 0.27 -- 5 Copper -- 0.4 1 2.8 -- 5 Iron -- 0.4 3.1 60 -- 15 Lithium -- 4.81 21.7 58.4 -- 6 Manganese -- 0.2 1.3 20 -- 15 Molybdenum -- 1.0 4.3 7.1 -- 6 Nickel -- 0.85 2.50 5.48 -- 5 Selenium -- 0.4 0.6 0.8 -- 6 Strontium -- 114 504 1,400 -- 5 Thallium -- 0.02 0.03 0.03 -- 5 Vanadium -- 0.4 1.8 3.8 -- 6 Zinc -- 1 2 116 -- 5 Radon-222 (picocuries -- 325 835 1,130 -- 4 per liter) Uranium -- 0.60 1.27 3.92 -- 5

Battle Spring pH (standard units) 6.8 7.6 8.2 8.3 9.5 34 Formation Specific conductance 161 270 425 769 3,750 25 (µS/cm)

Hardness (as CaCO3) 5 72 110 180 460 20 Calcium 0.1 19 33.9 64 151 33 Magnesium 0.02 2.2 3.9 5.1 56.6 33 Potassium 0.30 1.20 1.80 2.80 8 32

10-78 Appendix 4b 9

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Battle Spring Sodium-adsorption ratio 0.3 1 2.7 9.5 47 24 Formation— (unitless) continued Sodium 4.6 16.2 41.2 73.3 813 34

Alkalinity (as CaCO3) 74 92 114 135 331 25 Bromide 0.02 0.03 0.07 0.14 0.46 8 Chloride 0.2 3.4 5.4 10.2 237 34 Fluoride 0.1 0.2 0.3 0.4 2.4 27 Silica 8.2 9.9 15 18 26 25 Sulfate 2.7 28.5 61.8 208 1,420 34 Dissolved solids 102 173 280 439 2,820 33 Ammonia (as N) -- 0.003 0.012 0.070 -- 11 Nitrate+nitrite (as N) -- 0.018 0.067 0.565 -- 12 Nitrate (as N) -- 0.045 0.160 0.205 -- 5 Orthophosphate (as P) -- 0.004 0.009 0.020 -- 10 Aluminum -- 0.8 1.1 1.4 -- 17 Arsenic -- 0.4 0.8 2.0 -- 22 Barium -- 8.3 13.3 21.5 -- 17 Boron -- 20 31 49 -- 24 Cobalt -- 0.05 0.10 0.20 -- 13 Copper -- 0.7 1.2 2.1 -- 15 Iron -- 7.5 34.4 226 -- 22 Lead -- 0.002 0.02 0.14 -- 17 Lithium -- 4.6 6.0 22.4 -- 8 Manganese -- 1.8 20 97.5 -- 17 Molybdenum -- 0.7 1.1 2.0 -- 19 Nickel -- 0.79 1.33 2.23 -- 15 Selenium -- 0.1 0.3 1.2 -- 22 Strontium -- 342 439 1,480 -- 8 Vanadium -- 0.1 0.8 4.4 -- 17 Zinc -- 2 40 178 -- 15 Alpha-radioactivity -- 1.40 9.10 30.0 -- 8 (picocuries per liter) Radium-226 (picocuries -- 0.80 1.50 7.80 -- 7 per liter) Radium-226 -- 0.10 0.61 1.50 -- 7 (radon method) (picocuries per liter) Radium-228 (picocuries -- 0.26 0.61 1.22 -- 8 per liter)

10-79 10 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Battle Spring Radon-222 (picocuries -- 1,940 4,260 10,100 -- 9 Formation— per liter) continued Uranium -- 1.08 7.41 38.9 -- 12

Fort Union pH (standard units) 6.7 7.3 7.5 8 8.9 20 Formation Specific conductance 810 1,290 1,680 3,480 8,440 18 (µS/cm)

Hardness (as CaCO3) 4 120 480 880 1,500 18 Calcium 0.6 26.8 126 212 330 20 Magnesium 0.5 10.8 57 89.5 200 20 Potassium 1.60 3.28 6.90 8.43 24.3 18 Sodium-adsorption ratio 0.1 0.7 5.4 29 78 16 (unitless) Sodium 6.9 33.6 295 551 1,900 18

Alkalinity (as CaCO3) 78 362 514 701 1,170 13 Bromide 0.04 ------1 Chloride 2.5 10 43 91 2,000 21 Fluoride 0.1 0.2 0.4 1.4 3.7 19 Silica 6.9 7.8 8.3 11 22.5 16 Sulfate 6.8 176 430 1,270 2,300 20 Dissolved solids 522 827 1,130 2,590 7,210 21 Nitrate+nitrite (as N) -- 0.025 0.037 0.054 -- 7 Nitrate (as N) -- 0.100 0.270 0.600 -- 9 Phosphorus (as P) -- 0.009 0.010 0.040 -- 5 Aluminum -- 5 29 250 -- 9 Iron -- 432 850 3,250 -- 14 Lithium -- 16.9 31.7 50 -- 5 Manganese -- 63.8 120 418 -- 12 Vanadium -- 0.9 3.3 11.9 -- 5 Zinc -- 30 70 300 -- 10 Radium-226 -- 0.28 0.41 0.57 -- 4 (radon method) (picocuries per liter)

Mesozoic hydrogeologic units Lance Formation pH (standard units) 7.2 ------1 Specific conductance 2,210 ------1 (µS/cm)

Hardness (as CaCO3) 1,200 ------1 Calcium 367 ------1

10-80 Appendix 4b 11

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Lance Magnesium 66.9 ------1 Formation— Potassium 7.44 ------1 continued Sodium-adsorption ratio 1 ------1 (unitless) Sodium 77.9 ------1

Alkalinity (as CaCO3) 145 ------1 Bromide 0.22 ------1 Chloride 31 ------1 Fluoride 0.5 ------1 Silica 14.4 ------1 Sulfate 1,160 ------1 Dissolved solids 2,000 ------1

Lewis Shale pH (standard units) 6 7.2 7.7 8.6 9.2 6 Specific conductance 676 1,020 1,520 3,540 8,000 8 (µS/cm)

Hardness (as CaCO3) 7 110 350 700 29,000 6 Calcium 1.6 42.8 60.5 71.5 92 8 Magnesium 0.4 28.3 44.4 75.8 7,000 8 Potassium 2.40 5.15 7.85 24.7 74 8 Sodium-adsorption ratio 2.6 8.0 18 50 68 6 (unitless) Sodium 14.8 123 305 812 7,500 8

Alkalinity (as CaCO3) 274 535 757 852 1,290 6 Bromide 0.56 ------1 Chloride 2.5 8.0 19.2 119 150 8 Fluoride 0.3 0.7 1.8 4.0 9.1 8 Silica 0.3 5.8 7.5 9.3 11 6 Sulfate 0.1 60 103 848 42,000 8 Dissolved solids 280 704 952 2,490 57,700 8 Nitrate+nitrite (as N) -- 0.010 0.100 49.46 -- 5 Orthophosphate (as P) -- 0.021 0.030 0.050 -- 5 Phosphorus (as P) -- 0.013 0.020 0.035 -- 4 Boron -- 188 556 965 -- 8 Iron -- 29 110 480 -- 7 Manganese -- 18.8 50 615 -- 5

10-81 12 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesaverde pH (standard units) 6.8 7.6 8.0 8.5 8.8 18 Formation or Specific conductance 800 1,110 1,460 1,950 3,600 18 Group (µS/cm)

Hardness (as CaCO3) 6 12 24 510 1,300 14 Calcium 1.4 3.2 30.5 127 290 18 Magnesium 0.4 1.1 21.6 64.4 150 18 Potassium 2.20 3.90 5 6.40 13.9 17 Sodium-adsorption ratio 0.3 1.4 39 54 73 13 (unitless) Sodium 21 48 100 410 510 17

Alkalinity (as CaCO3) 240 407 589 902 1,890 14 Chloride 3.3 6.3 12.3 43 170 17 Fluoride 0.2 0.3 0.5 1.6 5.5 13 Silica 7 8.8 11 11.8 26 14 Sulfate 4.4 50.8 90 192 890 18 Dissolved solids 477 729 985 1,220 2,300 18 Nitrate+nitrite (as N) -- 0.011 0.022 0.043 -- 12 Orthophosphate (as P) -- 0.013 0.035 0.048 -- 12 Phosphorus (as P) -- 0.012 0.040 0.060 -- 7 Boron -- 75 160 428 -- 12 Iron -- 42.5 95 348 -- 16 Manganese -- 4.2 40 350 -- 7 Radium-226 -- 0.10 0.25 0.34 -- 4 (radon method) (picocuries per liter)

Almond pH (standard units) 7.5 8.0 8.3 8.6 8.7 7 Formation Specific conductance 560 593 625 793 1,750 7 of the (µS/cm) Mesaverde Group Hardness (as CaCO3) 3 5.5 15 72 300 7 Calcium 0.1 1.2 3.7 14.4 77 7 Magnesium 0.3 0.9 1.4 8.4 26 7 Potassium 1.60 2.35 2.90 8.85 12 7 Sodium-adsorption ratio 0.2 8.8 35 50.5 83 7 (unitless) Sodium 8.9 124 190 325 460 7

Alkalinity (as CaCO3) 300 325 390 705 980 7 Chloride 3.6 3.8 4.3 6.2 7.5 7 Fluoride 0.4 2 2 2.3 7.9 5

10-82 Appendix 4b 13

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Almond Silica 7.4 9 9.3 11 16 7 Formation Sulfate 3.3 6 15 27 37 7 of the Mesaverde Dissolved solids 337 382 483 783 1,090 7 Group— Ammonia (as N) -- 0.585 0.765 1.050 -- 4 continued Nitrate+nitrite (as N) -- 0.013 0.025 0.047 -- 7 Orthophosphate (as P) -- 0.010 0.030 0.090 -- 7 Phosphorus (as P) -- 0.020 0.080 0.100 -- 5 Boron -- 285 610 1,130 -- 5 Iron -- 10.1 20 60 -- 7 Radium-226 -- 0.07 0.18 0.72 -- 4 (radon method) (picocuries per liter)

Ericson Sandstone pH (standard units) 8.4 ------1 of the Mesa- Specific conductance 1,500 ------1 verde Group (µS/cm)

Hardness (as CaCO3) 8 ------1 Calcium 2.9 ------1 Magnesium 0.2 ------1 Potassium 1.50 ------1 Sodium-adsorption ratio 58 ------1 (unitless) Sodium 380 ------1

Alkalinity (as CaCO3) 689 ------1 Chloride 78 ------1 Fluoride 4.9 ------1 Silica 10 ------1 Sulfate 24 ------1 Dissolved solids 915 ------1

Allen Ridge pH (standard units) 7.5 -- 8.2 -- 8.3 3 Formation Specific conductance 340 -- 520 -- 1,330 3 of the (µS/cm) Mesaverde Group Hardness (as CaCO3) 170 -- 270 -- 550 3 Calcium 52 -- 64 -- 67 3 Magnesium 8.8 -- 24 -- 94 3 Potassium 1.30 -- 2.20 -- 4.10 3 Sodium-adsorption ratio 0.2 -- 0.3 -- 1.8 3 (unitless)

10-83 14 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Allen Ridge Sodium 6.8 -- 10 -- 97 3 Formation Alkalinity (as CaCO ) 164 -- 255 -- 578 3 of the 3 Mesaverde Chloride 3.7 -- 4.9 -- 10 3 Group— Sulfate 11 -- 17 -- 180 3 continued Dissolved solids 183 -- 278 -- 796 3

Haystack pH (standard units) 7.7 -- 7.8 -- 8.3 3 Mountains Specific conductance 520 -- 610 -- 720 3 Formation (µS/cm) of the Mesaverde Hardness (as CaCO3) 260 -- 310 -- 360 3 Group Calcium 63 -- 75 -- 76 3 Magnesium 17 -- 28 -- 48 3 Potassium 1.20 -- 1.20 -- 1.70 3 Sodium-adsorption ratio 0.3 -- 0.3 -- 0.3 3 (unitless) Sodium 10 -- 13 -- 15 3

Alkalinity (as CaCO3) 254 -- 266 -- 278 3 Chloride 5.7 -- 11 -- 20 3 Sulfate 17 -- 65 -- 89 3 Dissolved solids 284 -- 350 -- 403 3

Cody Shale pH (standard units) 7.3 -- 7.7 -- 7.8 3 Specific conductance 490 -- 1,170 -- 3,330 3 (µS/cm)

Hardness (as CaCO3) 230 -- 240 -- 480 3 Calcium 46.3 -- 56.1 -- 59 3 Magnesium 18.9 -- 29.8 -- 81.9 3 Potassium 2.85 -- 4.71 -- 9.06 3 Sodium-adsorption ratio 0.7 -- 5.1 -- 13 3 (unitless) Sodium 22.9 -- 180 -- 663 3

Alkalinity (as CaCO3) 291 -- 330 -- 583 3 Bromide 0.05 -- 0.26 -- 1.02 3 Chloride 3.3 -- 32.8 -- 143 3 Fluoride 0.3 -- 1.7 -- 1.7 3 Silica 9.7 -- 11.5 -- 14.2 3 Sulfate 25.6 -- 247 -- 987 3 Dissolved solids 291 -- 744 -- 2,340 3

10-84 Appendix 4b 15

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Steele Shale pH (standard units) 7.4 ------1 Specific conductance 2,150 ------1 (µS/cm)

Hardness (as CaCO3) 990 ------1 Calcium 150 ------1 Magnesium 150 ------1 Potassium 4.60 ------1 Sodium-adsorption ratio 2.6 ------1 (unitless) Sodium 190 ------1

Alkalinity (as CaCO3) 480 ------1 Chloride 31 ------1 Fluoride 0.4 ------1 Silica 9.3 ------1 Sulfate 850 ------1 Dissolved solids 1,670 ------1

Niobrara pH (standard units) 7.4 ------1 Formation Specific conductance 980 ------1 (µS/cm)

Hardness (as CaCO3) 420 ------1 Calcium 120 ------1 Magnesium 30 ------1 Potassium 2.90 ------1 Sodium-adsorption ratio 0.2 ------1 (unitless) Sodium 7.6 ------1

Alkalinity (as CaCO3) 280 ------1 Chloride 4.1 ------1 Fluoride 0.2 ------1 Silica 9.5 ------1 Sulfate 150 ------1 Dissolved solids 492 ------1

10-85 16 Appendix 4b

Appendix 4b. Summary statistics for environmental water samples, Great Divide/Washakie/Sand Wash basins, Wyoming. — Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Precambrian hydrogeologic units Undifferentiated pH (standard units) 7.6 ------1 Precambrian Specific conductance 260 ------1 rocks (µS/cm)

Hardness (as CaCO3) 88 ------1 Calcium 27 ------1 Magnesium 5.1 ------1 Potassium 4 ------1 Sodium-adsorption ratio 0.7 ------1 (unitless) Sodium 16 ------1

Alkalinity (as CaCO3) 114 ------1 Chloride 10 ------1 Fluoride 0.5 ------1 Silica 39 ------1 Sulfate 16 ------1 Dissolved solids 188 ------1

10-86 Appendix 4c 1

Appendix 4c. Summary statistics for environmental water samples, Rawlins Uplift, Wyoming.

[NA, not applicable; µS/cm, microsiemens per centimeter at 25 degrees Celsius; CaCO3, calcium carbonate. Values are in milligrams per liter unless otherwise noted]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesozoic hydrogeologic units Chugwater pH (standard units) 7.2 NA NA NA NA 1 Formation or Specific conductance 1,640 NA NA NA NA 1 Group (µS/cm)

Hardness (as CaCO3) 1,000 NA NA NA NA 1 Calcium 277 NA NA NA NA 1 Magnesium 78.8 NA NA NA NA 1 Potassium 2.21 NA NA NA NA 1 Sodium-adsorption ratio 0.4 NA NA NA NA 1 (unitless) Sodium 28.7 NA NA NA NA 1

Alkalinity (as CaCO3) 184 NA NA NA NA 1 Bromide 0.08 NA NA NA NA 1 Chloride 9.2 NA NA NA NA 1 Fluoride 0.3 NA NA NA NA 1 Silica 15.1 NA NA NA NA 1 Sulfate 776 NA NA NA NA 1 Dissolved solids 1,420 NA NA NA NA 1

Paleozoic hydrogeologic units Tensleep pH (standard units) 7.9 NA NA NA NA 1 Sandstone Specific conductance 581 NA NA NA NA 1 (µS/cm)

Hardness (as CaCO3) 250 NA NA NA NA 1 Calcium 43 NA NA NA NA 1 Magnesium 35 NA NA NA NA 1 Potassium 2.40 NA NA NA NA 1 Sodium-adsorption ratio 0.7 NA NA NA NA 1 (unitless) Sodium 27 NA NA NA NA 1

Alkalinity (as CaCO3) 180 NA NA NA NA 1 Chloride 200 NA NA NA NA 1 Fluoride 0.1 NA NA NA NA 1 Silica 3.6 NA NA NA NA 1 Sulfate 93 NA NA NA NA 1 Dissolved solids 334 NA NA NA NA 1

10-87 Appendix 4d 1

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

[--, not applicable; µS/cm, microsiemens per centimeter at 25 degrees Celsius; CaCO3, calcium carbonate; N, nitrogen; P, phosphorus. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units Alluvium pH (standard units) 6.8 6.9 7.2 7.5 7.7 5 Specific conductance 3,510 5,420 10,100 18,200 22,100 5 (µS/cm)

Hardness (as CaCO3) 1,500 2,100 4,000 4,000 6,000 5 Calcium 236 414 425 478 520 5 Magnesium 215 245 650 728 1,160 5 Potassium 5.60 15 33.2 79.2 87.2 5 Sodium-adsorption ratio 1.3 8.6 9.5 22 40 5 (unitless) Sodium 135 835 1,250 3,820 5,800 5

Alkalinity (as CaCO3) 418 -- 766 -- 1,090 3 Chloride 57.7 445 788 2,730 8,200 5 Fluoride 0.5 0.7 1.2 1.4 1.7 5 Silica 9.1 11.4 12.6 16.2 26.3 4 Sulfate 1,790 2,280 4,810 4,900 9,490 5 Dissolved solids 3,300 4,570 9,360 21,100 21,200 5 Ammonia (as N) -- 0.100 0.130 0.360 -- 3 Nitrate (as N) -- 0.275 1.300 33.75 -- 4 Nitrite (as N) -- 0.009 0.041 0.106 -- 3 Aluminum -- 1 6 58 -- 4 Antimony -- 0.18 0.45 1.66 -- 3 Arsenic -- 1.8 3.4 6.5 -- 4 Barium -- 15 18 20 -- 3 Boron -- 2,040 3,160 6,880 -- 3 Cadmium -- 0.06 0.2 0.3 -- 4 Chromium -- 2.8 4.3 6.7 -- 4 Cobalt -- 1.65 3.07 4.10 -- 3 Copper -- 12.6 18.7 63.2 -- 5 Iron -- 24.2 1,400 15,300 -- 5 Lead -- 0.14 1.03 7.36 -- 5 Lithium -- 195 354 710 -- 3 Manganese -- 774 2,200 2,970 -- 5 Molybdenum -- 3.4 3.6 18.1 -- 3 Nickel -- 8.75 14.5 26.5 -- 3 Selenium -- 1.4 4.7 26.1 -- 4 Strontium -- 1,430 1,720 5,490 -- 3 Vanadium -- 1.5 3.2 4.1 -- 3 Zinc -- 15 30 236 -- 5

10-88 2 Appendix 4d

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Igneous extrusive pH (standard units) 7.4 ------1 rock Specific conductance 420 ------1 (µS/cm)

Hardness (as CaCO3) 170 ------1 Calcium 48 ------1 Magnesium 12 ------1 Potassium 22 ------1 Sodium-adsorption ratio 0.2 ------1 (unitless) Sodium 7.3 ------1

Alkalinity (as CaCO3) 170 ------1 Chloride 9 ------1 Fluoride 0.2 ------1 Silica 29 ------1 Sulfate 27 ------1 Dissolved solids 259 ------1

Mesozoic hydrogeologic units Lance Formation pH (standard units) 7.4 7.8 8.1 8.1 8.3 5 Specific conductance 2,200 3,600 3,910 4,000 5,780 5 (µS/cm)

Hardness (as CaCO3) 25 34 40 55 180 5 Calcium 3.1 5 10 12 15 5 Magnesium 2.2 4.2 5.3 7.1 34 5 Potassium 3.70 4.40 5.80 6.30 19 5 Sodium-adsorption ratio 50 54 64 68 82 5 (unitless) Sodium 740 906 920 1,170 1,530 5 Chloride 28 52 52 86 980 5 Fluoride 0.2 1 1.5 3.3 7.7 5 Silica 6.9 7.1 7.9 12 15 5 Sulfate 21 233 1,130 1,200 1,800 5 Dissolved solids 1,780 2,740 2,980 3,280 4,910 5 Nitrate (as N) -- 0.150 0.600 1.300 -- 5 Aluminum -- 100 400 16,200 -- 5 Iron -- 140 500 1,350 -- 5 Manganese -- 90.4 200 300 -- 5

10-89 Appendix 4d 3

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesaverde Forma- pH (standard units) 7.2 -- 7.8 -- 7.80 3 tion or Group Specific conductance 578 -- 2200 -- 8,230 3 (µS/cm)

Hardness (as CaCO3) 180 -- 510 -- 4,100 3 Calcium 8 -- 38 -- 510 3 Magnesium 20 -- 120 -- 690 3 Potassium 12 ------37 2 Sodium-adsorption ratio 1.1 ------4.6 2 (unitless) Sodium 35 ------240 2

Alkalinity (as CaCO3) 91 -- 591 -- 787 3 Chloride 18 -- 34 -- 600 3 Fluoride 0.1 ------1 2 Silica 6.4 -- 8.9 -- 16 3 Sulfate 160 -- 490 -- 4,400 3 Dissolved solids 342 -- 1,410 -- 7,860 3

Almond pH (standard units) 6.8 7.8 8.2 8.4 8.4 6 Formation Specific conductance 697 1,190 2,180 3,700 20,200 6 of the (µS/cm) Mesaverde Group Hardness (as CaCO3) 120 310 570 2,100 4,200 6 Calcium 21 71.9 105 340 520 6 Magnesium 17 30.5 74 320 720 6 Potassium 11 12.2 17 23.4 48 6 Sodium-adsorption ratio 0.4 0.5 2.3 28 39 5 (unitless) Sodium 29 51.3 76 552 5,900 6 Alkalinity (as CaCO3) 213 -- 278 -- 282 3 Chloride 5.5 30.5 44.5 79.5 8,400 6 Fluoride 0.4 0.7 1.3 1.5 5.2 6 Silica 6.3 7.6 11 14.2 14.7 4 Sulfate 126 301 426 1,770 5,100 6 Dissolved solids 459 777 1,510 3,250 21,100 6 Nitrate (as N) -- 0.144 0.230 0.500 -- 5 Iron -- 205 510 7,650 -- 5 Manganese -- 165 240 300 -- 4 Zinc -- 17 35 148 -- 4

10-90 4 Appendix 4d

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Ericson Sandstone pH (standard units) 6.1 6.6 7 7.4 7.4 5 or Formation Specific conductance 515 539 609 845 1,370 4 (µS/cm)

Hardness (as CaCO3) 250 -- 270 -- 680 3 Calcium 61 64.8 68.5 98.3 180 4 Magnesium 21 21 24.5 35 56 4 Potassium 4.50 9.38 12.5 14 14 4 Sodium-adsorption ratio 0.1 -- 0.4 -- 0.4 3 (unitless) Sodium 5.3 12.6 15.5 17.3 21 4

Alkalinity (as CaCO3) 84 -- 192 -- 227 3 Chloride 7 7.5 8.6 10 11 4 Fluoride 0.2 -- 0.2 -- 0.5 3 Silica 8.3 -- 9.3 -- 10 3 Sulfate 56 58.3 74.5 228 640 4 Dissolved solids 322 324 340 518 1,010 4

Rock Springs pH (standard units) 6.7 -- 7 -- 7.2 3 Formation Specific conductance 1,000 1,360 1,590 3,280 8,000 4 of the (µS/cm) Mesaverde Group Hardness (as CaCO3) 490 730 840 1,600 3,900 4 Calcium 110 162 195 288 520 4 Magnesium 53 74 83 224 640 4 Potassium 3.30 -- 10 -- 66 3 Sodium-adsorption ratio 0.8 -- 1.1 -- 13 3 (unitless) Sodium 41 -- 75 -- 1,800 3

Alkalinity (as CaCO3) 167 246 288 432 817 4 Chloride 16 16.8 27.5 354 1,300 4 Fluoride 0.3 0.3 0.3 0.5 1 4 Silica 9.6 9.6 9.8 10.5 12 4 Sulfate 280 512 670 1,710 4,600 4 Dissolved solids 697 992 1,190 3,320 9,430 4

10-91 Appendix 4d 5

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Blair Formation of pH (standard units) 7 7.2 7.3 7.4 7.6 4 the Mesaverde Specific conductance 670 ------1,660 2 Group (µS/cm)

Hardness (as CaCO3) 360 560 900 1,000 1,800 9 Calcium 90 106 114 142 179 6 Magnesium 34 61.2 72.7 101 150 6 Potassium 2.10 5.70 6.71 6.95 10.2 6 Sodium-adsorption ratio 0.1 -- 0.5 -- 0.7 3 (unitless) Sodium 4.2 37 44.4 106 537 9

Alkalinity (as CaCO3) 262 -- 327 -- 447 3 Chloride 3.8 17.3 29.5 32.0 248 6 Fluoride 0.2 -- 0.40 -- 0.9 3 Silica 13 -- 14 -- 17 3 Sulfate 110 310 630 790 1,660 9 Dissolved solids 415 765 1,290 1,520 3,720 9 Nitrate+nitrite (as N) -- 0.020 0.070 0.110 -- 3 Nitrate (as N) -- 0.483 2.360 3.610 -- 5 Orthophosphate (as P) -- 0.010 0.010 0.030 -- 3 Boron -- 70 200 220 -- 3 Iron -- 23.6 100 190 -- 7 Manganese -- 5.0 10 80 -- 7

10-92 6 Appendix 4d

Appendix 4d. Summary statistics for environmental water samples, Rock Springs Uplift, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Baxter Shale pH (standard units) 7.4 7.8 8 8.0 8.1 4 Specific conductance 400 468 530 758 1,320 4 (µS/cm)

Hardness (as CaCO3) 180 350 380 430 660 5 Calcium 38 71.8 84 96.3 130 4 Magnesium 20 30.5 37.5 51.3 82 4 Potassium 1.80 2.18 3 4.53 7 4 Sodium-adsorption ratio 0.1 0.2 0.4 0.8 1.4 4 (unitless) Sodium 6.3 13 19 84 85 5

Alkalinity (as CaCO3) 176 185 223 289 380 4 Chloride 2.7 3 5.1 14.6 37 4 Fluoride 0.2 0.3 0.4 0.6 1.1 4 Silica 9 9.8 10.5 13.8 22 4 Sulfate 35 160 170 250 380 5 Dissolved solids 248 425 472 710 961 5 Nitrate+nitrite (as N) -- 0.010 0.175 0.385 -- 4 Orthophosphate (as P) -- 0.009 0.010 0.018 -- 4 Phosphorus (as P) -- 0.009 0.010 0.018 -- 4 Boron -- 38 80 302 -- 4 Iron -- 14.1 35 85 -- 4

Nugget Sandstone pH (standard units) 7.2 ------1

Hardness (as CaCO3) 300 ------1 Calcium 78 ------1 Magnesium 26 ------1 Potassium 190 ------1 Sodium-adsorption ratio 68 ------1 (unitless) Sodium 2,700 ------1

Alkalinity (as CaCO3) 480 ------1 Chloride 3,700 ------1 Fluoride 6.1 ------1 Silica 21 ------1 Sulfate 200 ------1 Dissolved solids 7,220 ------1

10-93 Appendix 4e 1

Appendix 4e. Summary statistics for environmental water samples, Fossil Basin, Wyoming. —Continued

[--, not applicable; µS/cm, microsiemens per centimeter at 25 degrees Celsius; CaCO3, calcium carbonate; N, nitrogen. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesozoic hydrogeologic units Holocene pH (standard units) 7.2 7.4 7.6 7.6 7.6 5 alluvium Specific conductance 434 825 1,180 1,360 1,760 5 (µS/cm)

Hardness (as CaCO3) 220 310 480 600 680 5 Calcium 70 80 120 140 170 5 Magnesium 10 27 43 60 61 5 Potassium 1.20 1.90 2.90 3.70 6.90 5 Sodium-adsorption ratio 0.2 0.5 1.1 1.9 2.3 5 (unitless) Sodium 7.2 26 43 96 140 5

Alkalinity (as CaCO3) 206 234 265 287 375 5 Chloride 7.1 15 27 72 110 5 Fluoride 0.2 0.2 0.2 0.3 0.4 5 Silica 7.6 9.9 9.9 10 11 5 Sulfate 17 140 260 260 590 5 Dissolved solids 248 458 798 858 1,350 5 Ammonia (as N) -- 0.019 0.050 0.140 -- 5 Nitrate+nitrite (as N) -- 0.070 0.310 1.225 -- 5 Iron -- 10.2 58 335 -- 5 Manganese -- 1.7 5 12.5 -- 5

Terrace gravel pH (standard units) 7.4 ------8 2 deposits Specific conductance 579 ------772 2 (µS/cm)

Hardness (as CaCO3) 280 ------360 2 Calcium 79 ------95 2 Magnesium 19 ------31 2 Potassium 2.80 ------1 Sodium-adsorption ratio 0.5 ------0.8 2 (unitless) Sodium 18 ------36 2

Alkalinity (as CaCO3) 252 ------1 Chloride 14 ------22 2 Fluoride 0.3 ------1 Silica 14 ------17 2 Sulfate 43 ------131 2 Dissolved solids 344 ------1

10-94 2 Appendix 4e

Appendix 4e. Summary statistics for environmental water samples, Fossil Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Undifferentiated pH (standard units) 7.9 ------1 Tertiary rocks Specific conductance 542 ------1 (µS/cm)

Hardness (as CaCO3) 9 ------1 Calcium 2.8 ------1 Magnesium 0.5 ------1 Sodium-adsorption ratio 19 ------1 (unitless) Sodium 134 ------1 Chloride 6 ------1 Silica 9.1 ------1 Sulfate 27 ------1

Undifferentiated pH (standard units) 7.6 ------1 Eocene rocks Specific conductance 700 ------1 (µS/cm)

Hardness (as CaCO3) 380 ------1 Calcium 73 ------1 Magnesium 47 ------1 Potassium 3.60 ------1 Sodium-adsorption ratio 0.4 ------1 (unitless) Sodium 19 ------1

Alkalinity (as CaCO3) 361 ------1 Chloride 17 ------1 Fluoride 0.4 ------1 Silica 8.2 ------1 Sulfate 38 ------1 Dissolved solids 423 ------1

10-95 Appendix 4e 3

Appendix 4e. Summary statistics for environmental water samples, Fossil Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Fossil Butte pH (standard units) 7.3 7.5 7.6 7.8 8 5 Member of Specific conductance 310 345 675 720 755 5 Green River (µS/cm) Formation Hardness (as CaCO3) 170 -- 320 -- 380 3 Calcium 37 -- 57 -- 77 3 Magnesium 19 -- 44 -- 45 3 Potassium 0.50 -- 2.40 -- 2.60 3 Sodium-adsorption ratio 0.2 -- 0.4 -- 0.5 3 (unitless) Sodium 6.4 -- 17 -- 22 3

Alkalinity (as CaCO3) 178 -- 264 -- 332 3 Chloride 2.6 -- 15 -- 18 3 Fluoride 0.4 -- 0.6 -- 0.7 3 Silica 7.5 -- 11 -- 14 3 Sulfate 6 -- 83 -- 84 3 Dissolved solids 190 -- 404 -- 456 3

Wasatch pH (standard units) 7.3 7.5 7.6 7.8 8 16 Formation Specific conductance 349 446 642 753 1,500 16 (µS/cm)

Hardness (as CaCO3) 170 200 280 330 780 12 Calcium 44 58 63.5 71.5 180 12 Magnesium 3.3 11.5 29.5 42.3 79 12 Potassium 0.50 1 1.40 4.55 9 11 Sodium-adsorption ratio 0.1 0.1 0.3 0.4 10 11 (unitless) Sodium 1.7 2.9 11 15 300 11

Alkalinity (as CaCO3) 145 197 238 307 364 12 Chloride 0.9 3.0 20.5 26.5 48 12 Fluoride 0.1 0.2 0.3 0.4 1 11 Silica 5 6.1 7.1 8.2 9.3 12 Sulfate 3.8 15.5 27 43.3 590 12 Dissolved solids 201 255 340 391 1,090 12 Nitrate+nitrite (as N) -- 0.110 0.220 0.320 -- 7 Orthophosphate (as P) -- 0.010 0.010 0.025 -- 6 Boron -- 32 65 130 -- 6 Iron -- 3.6 60 65 -- 9

10-96 4 Appendix 4e

Appendix 4e. Summary statistics for environmental water samples, Fossil Basin, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Bullpen Member pH (standard units) 8 ------1 of Wasatch Specific conductance 350 ------1 Formation (µS/cm)

Hardness (as CaCO3) 190 ------1 Calcium 59 ------1 Magnesium 11 ------1 Potassium 0.70 ------1 Sodium-adsorption ratio 0.10 ------1 (unitless) Sodium 1.6 ------1

Alkalinity (as CaCO3) 189 ------1 Chloride 3.6 ------1 Fluoride 0.1 ------1 Silica 5.7 ------1 Sulfate 1.6 ------1 Dissolved solids 197 ------1

Evanston pH (standard units) 7.9 ------7.90 2 Formation Specific conductance 494 ------1,250 2 (µS/cm)

Hardness (as CaCO3) 210 ------740 2 Calcium 66 ------210 2 Magnesium 10 ------49 2 Potassium 1.90 ------1 Sodium-adsorption ratio 0.2 ------0.70 2 (unitless) Sodium 11 ------22 2

Alkalinity (as CaCO3) 140 ------1 Chloride 7.5 ------12 2 Fluoride 1.8 ------1 Silica 8.2 ------29 2 Sulfate 38 ------600 2 Dissolved solids 1,020 ------1

10-97 Appendix 4f 1

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units Holocene pH (standard units) 7.3 -- 7.5 -- 7.7 3 alluvium Specific conductance 1,520 -- 2,470 -- 4,340 3 (µS/cm)

Hardness (as CaCO3) 510 -- 900 -- 910 3 Calcium 100 -- 220 -- 220 3 Magnesium 61 -- 86 -- 86 3 Potassium 8.10 ------1 Sodium-adsorption ratio 3 ------1 (unitless) Sodium 200 ------1

Alkalinity (as CaCO3) 290 -- 307 -- 436 3 Chloride 59 -- 210 -- 220 3 Fluoride 0.3 ------1 Silica 9.3 -- 10 -- 12 3 Sulfate 480 -- 780 -- 1,800 3 Dissolved solids 1,070 -- 1,840 -- 3,440 3

Terrace gravel pH (standard units) 7.7 ------1 deposits Specific conductance 463 ------1 (µS/cm)

Blind Bull pH (standard units) 7.1 ------1 Formation Specific conductance 343 ------1 (µS/cm)

Hardness (as CaCO3) 140 ------1 Calcium 43 ------1 Magnesium 7.3 ------1 Potassium 2.80 ------1 Sodium-adsorption ratio 0.7 ------1 (unitless) Sodium 19 ------1

Alkalinity (as CaCO3) 166 ------1 Chloride 1.9 ------1 Fluoride 0.1 ------1 Silica 6.9 ------1 Sulfate 8.8 ------1 Dissolved solids 190 ------1

10-98 2 Appendix 4f

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Hilliard Shale pH (standard units) 7.4 7.4 7.4 7.5 7.6 4 Specific conductance 560 749 846 1,610 3,790 4 (µS/cm)

Hardness (as CaCO3) 260 290 340 780 2,000 4 Calcium 70 83.5 93.5 204 520 4 Magnesium 19 20.5 27 69.8 180 4 Potassium 1 1.68 1.90 4.93 14 4 Sodium-adsorption ratio 0.2 0.4 0.8 1.3 2.3 4 (unitless) Sodium 8 14.8 32 95.3 240 4

Alkalinity (as CaCO3) 217 220 236 258 282 4 Chloride 4.5 7.2 16.6 53.8 140 4 Fluoride 0.1 0.2 0.2 0.3 0.40 4 Silica 7.3 10.1 11 11.8 14 4 Sulfate 50 59 116 652 2,100 4 Dissolved solids 328 332 454 1,270 3,340 4

Frontier pH (standard units) 7.3 7.7 8.1 8.2 9.8 8 Formation Specific conductance 315 720 1,170 1,340 2,400 9 (µS/cm)

Hardness (as CaCO3) 5 140 280 510 620 8 Calcium 1.4 48.8 80.5 120 140 8 Magnesium 0.4 4.4 19 49.8 64 8 Potassium 0.40 1.35 2.90 11.0 19 7 Sodium-adsorption ratio 0.8 1.2 2.2 8.2 50 6 (unitless) Sodium 1.3 41.8 108 185 611 8

Alkalinity (as CaCO3) 160 229 295 368 536 8 Chloride 0.8 9.5 14 55 323 9 Fluoride 0.1 0.2 0.5 0.9 5.2 7 Silica 7.3 8.2 8.8 11.2 12 8 Sulfate 11 26 59 320 470 9 Dissolved solids 187 460 657 939 1,470 9 Nitrate+nitrite (as N) -- 0.015 0.036 0.086 -- 7 Orthophosphate (as P) -- 0.010 0.030 0.030 -- 7 Phosphorus (as P) -- 0.004 0.010 0.030 -- 6 Boron -- 39 155 330 -- 6 Iron -- 14.1 70 500 -- 7 Manganese -- 11.9 30 40 -- 7

10-99 Appendix 4f 3

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Aspen Shale pH (standard units) 7.5 7.6 7.7 8.1 8.4 5 Specific conductance 590 619 625 1,460 10,200 5 (µS/cm)

Hardness (as CaCO3) 78 180 230 270 340 5 Calcium 23 51 58 66 77 5 Magnesium 5.1 12 16 19 47 5 Potassium 0.70 1.70 2.50 3.50 4 5 Sodium-adsorption ratio 0.5 1.6 2.4 4 110 5 (unitless) Sodium 19 56 74 170 2,180 5

Alkalinity (as CaCO3) 230 241 252 261 269 4 Chloride 16 20 31 160 3,120 5 Fluoride 0.4 0.5 0.5 0.6 2 5 Silica 9.7 11 11 12 17 5 Sulfate 0.8 37 56 76 230 5 Dissolved solids 334 376 397 886 5,570 5

Bear River pH (standard units) 7.3 ------7.8 2 Formation Specific conductance 484 ------510 2 (µS/cm)

Hardness (as CaCO3) 220 ------1 Calcium 68 ------1 Magnesium 12 ------1 Potassium 2.30 ------1 Sodium-adsorption ratio 0.5 ------1 (unitless) Sodium 17 ------1

Alkalinity (as CaCO3) 180 ------1 Chloride 8.4 ------1 Fluoride 0.5 ------1 Silica 9.4 ------1 Sulfate 57 ------1 Dissolved solids 283 ------1

10-100 4 Appendix 4f

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Gannett Group pH (standard units) 7.5 ------7.8 2 Specific conductance 225 ------462 2 (µS/cm)

Hardness (as CaCO3) 180 ------1 Calcium 49 ------1 Magnesium 15 ------1 Potassium 1.20 ------1 Sodium-adsorption ratio 0.5 ------1 (unitless) Sodium 15 ------1

Alkalinity (as CaCO3) 200 ------1 Chloride 6.2 ------1 Fluoride 0.2 ------1 Silica 14 ------1 Sulfate 17 ------1 Dissolved solids 238 ------1

Ephraim pH (standard units) 7.3 ------1 Conglom- Specific conductance 356 ------1 erate (µS/cm)

Hardness (as CaCO3) 190 ------1 Calcium 59 ------1 Magnesium 10 ------1 Potassium 1.1 ------1 Sodium-adsorption ratio 0.1 ------1 (unitless) Sodium 1.9 ------1

Alkalinity (as CaCO3) 180 ------1 Chloride 4.3 ------1 Fluoride 0.1 ------1 Silica 5.1 ------1 Sulfate 3.7 ------1 Dissolved solids 196 ------1

10-101 Appendix 4f 5

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Twin Creek pH (standard units) 7.7 ------7.7 2 Limestone Specific conductance 320 ------354 2 (µS/cm)

Hardness (as CaCO3) 190 ------1 Calcium 64 ------1 Magnesium 7.8 ------1 Potassium 0.80 ------1 Sodium-adsorption ratio 0.1 ------1 (unitless) Sodium 2.5 ------1

Alkalinity (as CaCO3) 190 ------1 Chloride 1.4 ------1 Fluoride 0.1 ------1 Silica 9.3 ------1 Sulfate 3 ------1 Dissolved solids 202 ------1

Nugget pH (standard units) 8 ------8 2 Sandstone Specific conductance 185 ------320 2 (µS/cm)

Hardness (as CaCO3) 95 ------170 2 Calcium 29 ------51 2 Magnesium 5.5 ------11 2 Potassium 0.60 ------0.90 2 Sodium-adsorption ratio 0.1 ------0.1 2 (unitless) Sodium 1.4 ------4.3 2

Alkalinity (as CaCO3) 100 ------170 2 Chloride 1.2 ------3.2 2 Fluoride 0.1 ------1 Silica 5.3 ------18 2 Sulfate 2.8 ------5.1 2 Dissolved solids 107 ------198 2

10-102 6 Appendix 4f

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Ankareh pH (standard units) 8.1 ------1 Formation Specific conductance 773 ------1 (µS/cm)

Hardness (as CaCO3) 430 ------1 Calcium 130 ------1 Magnesium 26 ------1 Potassium 1.60 ------1 Sodium-adsorption ratio 0.1 ------1 (unitless) Sodium 6.4 ------1

Alkalinity (as CaCO3) 167 ------1 Chloride 1.7 ------1 Fluoride 0.4 ------1 Silica 7.7 ------1 Sulfate 270 ------1 Dissolved solids 546 ------1

Thaynes Lime- pH (standard units) 7.6 ------7.9 2 stone Specific conductance 295 ------642 2 (µS/cm)

Hardness (as CaCO3) 260 ------1 Calcium 64 ------1 Magnesium 25 ------1 Potassium 0.80 ------1 Sodium-adsorption ratio 0.1 ------1 (unitless) Sodium 5.4 ------1

Alkalinity (as CaCO3) 153 ------1 Chloride 1.9 ------1 Fluoride 0.1 ------1 Silica 10 ------1 Sulfate 190 ------1 Dissolved solids 390 ------1

10-103 Appendix 4f 7

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Dinwoody pH (standard units) 8 ------8.4 2 Formation Specific conductance 174 ------271 2 (µS/cm)

Hardness (as CaCO3) 90 ------1 Calcium 23 ------1 Magnesium 8 ------1 Potassium 0.40 ------1 Sodium 0.7 ------1

Alkalinity (as CaCO3) 82 ------1 Chloride 0.4 ------1 Fluoride 0.3 ------1 Silica 5.3 ------1 Sulfate 4.1 ------1 Dissolved solids 97 ------1

Wells pH (standard units) 7.7 ------8.1 2 Formation Specific conductance 178 ------237 2 (µS/cm)

Hardness (as CaCO3) 90 ------130 2 Calcium 27 ------37 2 Magnesium 5.6 ------8.2 2 Potassium 0.70 ------0.70 2 Sodium-adsorption ratio 0.1 ------1 (unitless) Sodium 0.5 ------1.8 2

Alkalinity (as CaCO3) 118 ------1 Chloride 1 ------1.4 2 Fluoride 0.2 ------0.4 2 Silica 5.8 ------8.3 2 Sulfate 1.3 ------4.1 2 Dissolved solids 100 ------131 2

10-104 8 Appendix 4f

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Madison Group pH (standard units) 7.5 ------1 (upper and Hardness (as CaCO ) 190 ------1 lower Mis- 3 sissippian Calcium 48 ------1 Magnesium 17 ------1 Potassium 0.60 ------1 Sodium-adsorption ratio 0.10 ------1 (unitless) Sodium 2.3 ------1

Alkalinity (as CaCO3) 160 ------1 Chloride 3.1 ------1 Fluoride 0.3 ------1 Silica 5.8 ------1 Sulfate 28 ------1 Dissolved solids 199 ------1

Darby pH (standard units) 7.8 ------1 Formation Specific conductance 1,020 ------1 (µS/cm)

Hardness (as CaCO3) 420 ------1 Calcium 68 ------1 Magnesium 60 ------1 Potassium 1.20 ------1 Sodium-adsorption ratio 1 ------1 (unitless) Sodium 46 ------1

Alkalinity (as CaCO3) 342 ------1 Chloride 91 ------1 Fluoride 0.3 ------1 Silica 9.9 ------1 Sulfate 55 ------1 Dissolved solids 537 ------1

10-105 Appendix 4f 9

Appendix 4f. Summary statistics for environmental water samples, Overthrust Belt, Wyoming. —Continued

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Bighorn pH (standard units) 7.6 ------7.7 2 Dolomite Specific conductance 350 ------400 2 (µS/cm)

Hardness (as CaCO3) 220 ------260 2 Calcium 46 ------57 2 Magnesium 25 ------28 2 Potassium 0.40 ------0.70 2 Sodium-adsorption ratio 0.2 ------0.3 2 (unitless) Sodium 6 ------12 2

Alkalinity (as CaCO3) 180 ------194 2 Chloride 7.7 ------18 2 Fluoride 0.1 ------0.1 2 Silica 7 ------7.6 2 Sulfate 22 ------55 2 Dissolved solids 227 ------290 2

10-106 Appendix 4g 1

Appendix 4g. Summary statistics for environmental water samples, Gros Ventre Range, Wyoming.

[--, not applicable; µS/cm, microsiemens per centimeter at 25 degrees Celsius; CaCO3, calcium carbonate]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Paleozoic hydrogeologic units Phosphoria pH (standard units) 7.7 ------7.8 2 Formation Specific conductance 1,250 ------1,400 2 (µS/cm) Hardness 750 ------870 2 Calcium 215 ------220 2 Magnesium 52 ------78 2 Potassium 2.70 ------6.40 2 Sodium-adsorption ratio 0.1 ------0.1 2 (unitless) Sodium 4 ------8.8 2

Alkalinity (as CaCO3) 98 ------110 2 Chloride 3.2 ------13 2 Fluoride 2.1 ------2.3 2 Silica 12 ------15 2 Sulfate 650 ------730 2 Dissolved solids 1,000 ------1,140 2

10-107 10-108 Appendix 5 Summary statistics for produced water samples, Wyoming Greater Green River Basin

10-109 Appendix 5a 1

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units Undifferentiated pH (standard units) 7.1 7.8 8.2 8.4 8.6 4 Tertiary rocks Calcium 14 16.3 17.5 462.3 1,795 4 Magnesium 6 9 11 87.5 314 4 Potassium 9 12 13 53.5 175 4 Sodium 1,360 1,660 1,940 4,150 10,200 4 Bicarbonate 500 600 1,490 2,370 2,440 4 Chloride 590 1,430 2,020 6,690 19,800 4 Sulfate 100 -- 120 -- 260 3 Dissolved solids 3,430 4,250 4,910 12,100 32,600 4

Undifferentiated pH (standard units) 8.5 ------1 Eocene rocks Calcium 2 ------1 Magnesium 3 ------1 Potassium 14 ------1 Sodium 1,440 ------1 Bicarbonate 1,450 ------1 Chloride 336 ------1 Sulfate 731 ------1 Dissolved solids 3,680 ------1

Wasatch pH (standard units) 7.5 8.1 8.3 8.7 9.5 16 Formation Calcium 1 17 21 48 1,140 17 Magnesium 2 7 12 23 151 17 Potassium 1.2 11.5 18 28.3 35 6 Sodium 417 1,390 2,140 2,920 7,430 18 Bicarbonate 61 460 884 1,310 5,760 18 Carbonate 49 ------252 2 Chloride 37 1,270 2,320 3,340 9,340 18 Silica 13 ------1 Sulfate 3.3 14.5 110 1,060 3,380 15 Dissolved solids 1,050 3,670 5,810 7,400 20,600 18 Boron 900 ------1 Iron 1,000 ------1

Almy Formation pH (standard units) 7 7.9 8.3 8.6 8.9 84 (Wasatch Calcium 3 17 25 39 600 85 Formation) Magnesium 1 6 12 16 451 85 Potassium 8 11 17 22 120 58 Sodium 440 1,810 2,500 2,840 4,900 85

10-110 2 Appendix 5a

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Almy Formation Bicarbonate 200 952 1,330 1,950 7,970 85 (Wasatch Carbonate 18 ------1 Formation)— continued Chloride 190 1,980 2,900 3,600 6,500 85 Sulfate 2 15.5 30 104 3,890 63 Dissolved solids 1,150 4,770 6,330 7,340 13,100 85 Barium 2,900 ------1 Iron 300 ------2,300 2

Fort Union pH (standard units) 6.8 7.6 8 8.3 11.4 43 Formation Calcium 8 21.3 36.5 135 13,300 42 Magnesium 1 9.3 20 34.3 276 42 Potassium 9 14.3 26 115 250 14 Sodium 458 1,920 2,660 4,150 11,000 43 Bicarbonate 20 396 1,100 1,730 9,200 42 Carbonate 33 40.5 69 174 330 6 Chloride 140 2,160 3,160 5,870 31,300 43 Sulfate 3 21.5 84.5 288 1,110 34 Dissolved solids 1,170 5,700 7,180 11,900 51,200 42 Iron 950 4,000 6,270 16,000 25,000 7

Mesozoic hydrogeologic units Lance Formation pH (standard units) 6.2 6.9 7.2 7.6 8.5 181 Specific conductance 2,420 3,300 4,360 5,040 5,860 14 (µS/cm) Calcium 1.7 30 79 781 19,600 181 Magnesium 0.3 2.7 8 12 484 147 Potassium 3 29 37 55 370 141 Sodium-adsorption ratio 98 ------1 (unitless) Sodium 170 993 1,600 3,500 16,000 181 Bicarbonate 88 720 903 1,110 2,780 164 Carbonate 5 40.3 380 770 960 4 Chloride 199 1,220 4,500 5,650 30,600 181 Sulfate 2 15 37.5 77.3 1,750 174 Dissolved solids 698 3,830 9,180 10,900 49,400 181 Barium 400 1,550 2,450 8,920 20,000 34 Iron 200 7,800 19,600 46,100 209,000 138 Lithium 12,000 ------24,000 2

10-111 Appendix 5a 3

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesaverde pH (standard units) 6 7.7 8.2 8.4 8.9 74 Formation or Calcium 5 28 47 166 5,460 73 Group Magnesium 3 9 16 49 1,140 73 Potassium 7 17.5 32.8 52.8 500 42 Sodium 489 1,830 2,950 4,340 8,630 74 Bicarbonate 292 1,130 1,650 2,230 8,910 74 Carbonate 3 6 48 120 228 5 Chloride 120 1,860 3,700 5,760 23,800 74 Sulfate 1.9 25 110 258 1,880 62 Dissolved solids 1,330 5,570 8,350 11,300 38,900 74 Barium 2,000 -- 6,000 -- 8,400 3 Iron 70 2,010 6,600 15,500 44,900 14

Almond pH (standard units) 8.1 8.5 8.6 8.9 8.9 5 Formation of Calcium 11 11 20 20 74 5 the Mesaverde Group Magnesium 3 5 5 8 32 5 Potassium 10 ------12 2 Sodium 744 983 1,180 1,270 14,200 5 Bicarbonate 854 952 1,050 1,400 2,400 5 Chloride 160 530 820 1,130 20,800 5 Sulfate 220 274 396 504 514 4 Dissolved solids 1,990 2,610 3,000 3,300 37,500 5

Ericson Sandstone pH (standard units) 7.5 -- 7.5 -- 8.2 3 of the Calcium 14 -- 78 -- 115 3 Mesaverde Group Magnesium 3 -- 10 -- 14 3 Potassium 250 ------530 2 Sodium 706 -- 3,130 -- 3,780 3 Bicarbonate 696 -- 1,220 -- 2,040 3 Chloride 130 -- 3,750 -- 6,750 3 Sulfate 8 -- 383 -- 400 3 Dissolved solids 1,840 -- 9,670 -- 20,500 3 Iron 47,000 ------1

Rock Springs pH (standard units) 7.2 7.4 7.8 8 8.6 6 Formation Calcium 76 102 154 178 1,170 6 of the Mesa- verde Group Magnesium 25 43.3 64 311.3 537 6 Potassium 7 28 90 160 705 5 Sodium 274 1,770 14,600 37,700 54,800 6

10-112 4 Appendix 5a

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Rock Springs Bicarbonate 195 768 2,590 6,350 10,000 6 Formation Chloride 88 725 17,400 54,200 85,000 6 of the Mesa- verde Group— Sulfate 70 1,000 1,400 2,920 4,500 6 continued Dissolved solids 1,690 7,130 37,100 96,300 147,000 6

Blair Formation of pH (standard units) 6.9 -- 7.4 -- 8.3 3 the Mesaverde Calcium 8 -- 479 -- 1,110 3 Group Magnesium 3 -- 214 -- 490 3 Potassium 13 ------1 Sodium 7,990 -- 24,800 -- 35,700 3 Bicarbonate 805 -- 1,020 -- 5,390 3 Chloride 8,550 -- 34,000 -- 52,700 3 Sulfate 650 -- 6,980 -- 7,190 3 Dissolved solids 20,000 -- 67,000 -- 97,600 3

Adaville pH (standard units) 8.1 ------1 Formation Calcium 56 ------1 Magnesium 30 ------1 Potassium 28 ------1 Sodium 3,650 ------1 Bicarbonate 1,980 ------1 Chloride 3,140 ------1 Sulfate 2,120 ------1 Dissolved solids 10,000 ------1

Baxter Shale pH (standard units) 6.3 7.2 7.5 7.7 8 4 Calcium 2.5 29 190 376 466 6 Magnesium 0.1 7 41.5 107 169 6 Potassium 5.2 8.1 14.5 40.8 103 4 Sodium 175 1,980 5,980 6,970 7,580 6 Bicarbonate 117 1,110 1,270 1,370 1,710 6 Chloride 100 2,050 8,920 10,700 12,100 6 Sulfate 4.1 23 213 280 320 5 Dissolved solids 660 5,060 16,300 19,800 23,300 6 Iron 4,500 6,000 10,000 23,600 28,000 5

Hilliard Shale pH (standard units) 6.3 ------7.9 2 Calcium 81 84.8 95 254 2,110 6 Magnesium 28 32.8 35.5 37.5 219 6 Sodium 2,080 3,900 4,010 4,100 4,180 6

10-113 Appendix 5a 5

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Hilliard Shale— Bicarbonate 340 468 512 606 1,460 6 continued Chloride 5,980 6,090 6,270 6,380 6,600 6 Sulfate 188 ------555 2 Dissolved solids 10,400 10,700 10,800 11,000 12,700 6 Iron 19,000 ------1

Frontier pH (standard units) 5 6.9 7.3 7.6 10 307 Formation Calcium 2.3 59.6 102 211 4,300 307 Magnesium 0.1 6 12 31 734 303 Potassium 0.8 51.7 71.1 110 1,700 206 Sodium 74.7 1,920 2,970 4,080 25,500 310 Bicarbonate 8.7 427 634 938 10,900 300 Carbonate 9 -- 30 -- 5,340 3 Chloride 87.8 3,090 4,320 6,410 40,000 308 Sulfate 1.5 12 58 110 5,830 199 Dissolved solids 284 5,870 8,600 12,300 85,800 310 Barium 1,100 1,680 2,450 4,500 15,000 6 Iron 260 4,000 9,000 26,000 366,000 169 Manganese 2,000 ------1 Strontium 3,000 21,000 41,000 63,500 89,000 4

Muddy Sandstone pH (standard units) 6.6 7.1 7.4 7.9 8.2 11 and Thermopo- Calcium 91 216 356 815 7,100 11 lis Shale Magnesium 3 29.3 100 111 207 10 Potassium 29 34.3 39 70 154 4 Sodium 1,580 3,020 4,810 6,420 7,850 11 Bicarbonate 207 299 525 616 1,060 11 Chloride 2,420 4,750 8,100 11,800 22,400 11 Sulfate 5 5 5 14.5 29 10 Dissolved solids 4,510 8,350 13,600 19,600 36,500 11

Cloverly pH (standard units) 5.4 6.8 7.1 7.7 8.7 45 Formation Calcium 2.9 31 82 140 560 47 Magnesium 0.1 5 8 20 102 40 Potassium 2.2 21 47 109 5,410 29 Sodium 7 708 3,180 4,390 8,510 46 Bicarbonate 55 384 708 1,070 5,000 46 Chloride 26 915 5,000 7,650 12,300 47

10-114 6 Appendix 5a

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cloverly Sulfate 1 30 71 176 1,610 44 Formation— Dissolved solids 118 2,300 9,900 12,700 23,200 47 continued Barium 2,000 ------1 Iron 2,700 10,000 37,200 74,000 217,000 15 Strontium 76,000 ------1

Nugget Sandstone pH (standard units) 6.2 6.8 7.2 7.3 7.9 17 Calcium 390 1,060 1,480 2,430 3,500 19 Magnesium 9.8 120 214 312 2,140 19 Potassium 159 1,430 1,850 2,300 2,500 9 Sodium 6,000 8,260 29,000 32,600 35,500 19 Bicarbonate 74 286 390 499 990 19 Carbonate 12 ------14 2 Chloride 6,180 13,600 50,000 56,600 62,000 19 Sulfate 184 1,020 1,210 3,140 6,760 19 Dissolved solids 15,500 27,800 85,300 95,000 103,000 19

Ankareh pH (standard units) 7 ------1 Formation Calcium 1,000 ------1 Magnesium 893 ------1 Sodium 6,340 ------1 Bicarbonate 1,560 ------1 Chloride 8,890 ------1 Sulfate 5,900 ------1 Dissolved solids 23,800 ------1

Thaynes Lime- pH (standard units) 6.8 -- 7.8 -- 8 3 stone Calcium 486 -- 929 -- 1,000 3 Magnesium 160 -- 460 -- 763 3 Potassium 580 ------1 Sodium 5,560 -- 5,910 -- 7,700 3 Bicarbonate 465 -- 2,480 -- 2,560 3 Chloride 4,250 -- 7,200 -- 11,400 3 Sulfate 4,320 -- 6,040 -- 6,360 3 Dissolved solids 18,400 -- 22,400 -- 25,800 3

Woodside Shale pH (standard units) 7.6 ------1 Calcium 1,140 ------1 Magnesium 403 ------1

10-115 Appendix 5a 7

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Woodside Shale— Sodium 4,510 ------1 continued Bicarbonate 2,880 ------1 Chloride 5,400 ------1 Sulfate 4,160 ------1 Dissolved solids 17,000 ------1

Dinwoody pH (standard units) 6.8 -- 7.1 -- 7.8 3 Formation Calcium 172 -- 528 -- 792 3 Magnesium 462 -- 596 -- 874 3 Potassium 295 ------362 2 Sodium 3,490 -- 3,910 -- 4,830 3 Bicarbonate 2,570 -- 3,530 -- 3,800 3 Chloride 3,700 -- 4,700 -- 5,400 3 Sulfate 3,000 -- 3,660 -- 4,500 3 Dissolved solids 14,000 -- 15,400 -- 16,800 3

Paleozoic hydrogeologic units Phosphoria pH (standard units) 6.8 ------1 Formation Calcium 612 ------1 Magnesium 530 ------1 Sodium 4,670 ------1 Bicarbonate 3,250 ------1 Chloride 5,500 ------1 Sulfate 3,300 ------1 Dissolved solids 16,200 ------1

Weber Sandstone pH (standard units) 6.5 6.9 7 7.5 7.8 9 Calcium 526 872 945 962 1,170 9 Magnesium 226 446 504 565 580 9 Potassium 418 ------1 Sodium 3,760 3,920 4,640 4,740 5,250 9 Bicarbonate 1,400 2,830 3,290 3,540 5,200 9 Chloride 2,430 4,700 5,250 5,500 6,800 9 Sulfate 3,230 3,840 4,230 4,730 5,140 9 Dissolved solids 14,000 15,800 16,800 17,600 19,100 9

Morgan Formation pH (standard units) 5.1 -- 5.5 -- 8.4 3 Calcium 69 -- 996 -- 17,200 3 Magnesium 12 -- 176 -- 6,540 3

10-116 8 Appendix 5a

Appendix 5a. Summary statistics for produced water samples, Green River Basin, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Morgan Potassium 41 -- 600 -- 900 3 Formation— Sodium 3,210 -- 9,200 -- 15,100 3 continued Bicarbonate 964 -- 1,110 -- 3,420 3 Chloride 4,200 -- 24,000 -- 63,500 3 Sulfate 267 -- 360 -- 560 3 Dissolved solids 8,460 -- 43,400 -- 97,900 3

Amsden pH (standard units) 7 8.8 8.9 9.3 10.9 6 Formation Calcium 122 213 330 440 1,140 6 Magnesium 1 2 7 92 231 5 Potassium 46 48 82 89 106 5 Sodium 3,720 4,680 6,820 7,290 7,680 6 Bicarbonate 634 805 1,420 1,940 3,560 6 Carbonate 24 36 96 120 336 5 Chloride 600 630 820 988 10,200 6 Sulfate 4,310 7,340 9,980 12,400 12,600 6 Dissolved solids 12,300 15,100 21,000 23,000 24,600 6

Madison pH (standard units) 6.9 ------7.2 2 Limestone Calcium 816 ------848 2 Magnesium 337 ------391 2 Potassium 1,850 ------1 Sodium 6,440 ------27,200 2 Bicarbonate 2,270 ------2,640 2 Chloride 8,180 ------43,400 2 Sulfate 1,800 ------3,860 2 Dissolved solids 20,800 ------76,800 2

Bighorn Dolomite pH (standard units) 8.4 -- 8.7 -- 9.6 3 Calcium 45 -- 49 -- 172 3 Magnesium 1 -- 29 -- 31 3 Potassium 4 -- 6 -- 92 3 Sodium 310 -- 616 -- 25,200 3 Bicarbonate 323 -- 376 -- 1,070 3 Carbonate 41 -- 78 -- 751 3 Chloride 218 -- 636 -- 32,600 3 Sulfate 217 -- 276 -- 6,900 3 Dissolved solids 1,050 -- 1,850 -- 66,200 3

10-117 Appendix 5b 1

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Cenozoic hydrogeologic units Tipton Shale pH (standard units) 8.1 ------1 Member of the Calcium 2,020 ------1 Green River Formation Magnesium 717 ------1 Sodium 37,400 ------1 Bicarbonate 176 ------1 Chloride 60,200 ------1 Sulfate 4,230 ------1 Dissolved solids 105,000 ------1

Wasatch pH (standard units) 5.5 7.3 8.2 8.3 8.8 37 Formation Calcium 3 36 133 1,460 8,360 46 Magnesium 1 11 32.5 123 924 44 Potassium 2 11.9 22 67 260 19 Sodium 375 1,680 4,830 9,980 50,000 46 Bicarbonate 30 202 854 2,230 5,280 43 Carbonate 24 ------1 Chloride 48 1,180 7,090 17,900 80,500 46 Sulfate 5 30.5 92 446 2,900 42 Dissolved solids 947 4,780 13,700 29,800 136,000 46 Iron 2,230 ------3,630 2

Cathedral Bluffs pH (standard units) 8.4 ------1 Tongue of the Calcium 14 ------1 Wasatch For- mation Magnesium 5 ------1 Potassium 28 ------1 Sodium 1,280 ------1 Bicarbonate 1,560 ------1 Chloride 340 ------1 Sulfate 1,080 ------1 Dissolved solids 3,510 ------1

Niland Tongue Calcium 686 ------1 of the Wasatch Sodium 3,570 ------1 Formation Chloride 6,000 ------1 Sulfate 53 ------1 Dissolved solids 10,400 ------1

10-118 2 Appendix 5b

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Fort Union pH (standard units) 6.4 7.5 7.8 8.3 8.9 73 Formation Calcium 5 31.7 200 621 11,800 74 Magnesium 2 9.7 50 127 1,180 72 Potassium 6 15 53 90.9 685 37 Sodium 492 1,230 3,250 8,140 55,900 74 Bicarbonate 24 647 1,160 1,700 3,500 73 Carbonate 42 ------42 2 Chloride 16 1,030 5,000 14,000 93,000 74 Sulfate 1 29.5 94 469 8,050 71 Dissolved solids 1,170 3,600 11,200 24,200 153,000 74 Iron 1,240 6,320 26,000 34,900 359,000 23 Lithium 160 ------1

Mesozoic hydrogeologic units Lance Formation pH (standard units) 6.6 7.6 8.2 8.6 9.3 37 Calcium 3 18 53 296 2,440 37 Magnesium 1 6.5 17.5 76 528 36 Potassium 3 29 40 52 250 25 Sodium 497 1,140 3,160 11,100 27,800 37 Bicarbonate 230 756 1,340 2,010 5,000 37 Carbonate 234 ------1 Chloride 58 500 3,620 16,800 46,500 37 Sulfate 2 40.8 108 427 2,790 34 Dissolved solids 1,200 3,160 8,140 29,000 80,400 37 Barium 82,600 ------1 Iron 220 2,010 8,520 15,800 16,000 6

Fox Hills pH (standard units) 7.6 7.8 8.3 8.4 9.1 13 Sandstone Calcium 6.3 17 52 95 649 13 Magnesium 2 10 16.6 51 169 13 Potassium 7 16 26.8 35.5 93 8 Sodium 1,150 1,580 5,150 9,770 24,800 13 Bicarbonate 293 769 1,020 2,200 6,140 13 Carbonate 132 ------201 2 Chloride 540 1,380 6,200 13,200 39,000 13 Sulfate 4 93.3 486 995 6,400 8 Dissolved solids 3,330 4,160 14,800 25,400 64,800 13 Iron 4,000 ------7,000 2 Lithium 5,000 ------1

10-119 Appendix 5b 3

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Lewis Shale pH (standard units) 4.2 7.3 7.9 8.2 8.9 56 Calcium 3 21 58 218 3,500 55 Magnesium 1.6 7 12 61 867 53 Potassium 8 26.2 57 89.1 6,510 46 Sodium 69 1,550 3,080 5,900 20,800 56 Bicarbonate 31 816 1,610 2,550 4,310 56 Carbonate 0.1 0.1 6 84 300 4 Chloride 64 1,600 4,120 9,810 32,000 56 Sulfate 2 20 60.4 108 4,000 52 Dissolved solids 720 5,290 9,200 18,100 54,600 56 Barium 34,000 ------1 Iron 320 2,160 7,000 22,500 72,000 18 Lead 90 ------1 Lithium 3,200 ------1

Mesaverde pH (standard units) 4.6 7.2 7.5 8 11.7 440 Formation or Calcium 0.01 14 29 58.9 3,100 467 Group Magnesium 0.01 3.3 7.3 16.6 1,970 397 Potassium 2.7 15 33 63.8 4,200 377 Sodium-adsorption ratio 20 31 71 140 310 19 (unitless) Sodium 112 1,860 2,680 3,500 61,200 469 Bicarbonate 54 1,240 1,830 2,500 9,880 443 Carbonate 12 30.3 53.4 63 264 28 Chloride 2.3 1,800 3,400 4,750 94,000 469 Fluoride 2.2 ------2.4 2 Sulfate 1 12 27 87.4 14,600 437 Dissolved solids 392 5,810 8,350 10,900 157,000 467 Aluminum 60 75 85 292 900 4 Arsenic 1.4 -- 10 -- 120 3 Barium 190 2,480 5,340 12,100 65,400 106 Boron 300 462 650 875 1,040 6 Cadmium 10 -- 20 -- 40 3 Chromium 3 9.3 25 40 50 6 Copper 30 30 35 55 100 4 Iron 10 572 4,270 12,100 192,000 280 Lead 10 -- 20 -- 90 3 Lithium 150 ------1,380 2 Manganese 10 30 40 162 530 18 Selenium 40 ------1 Zinc 10 25 80 115 3,200 7

10-120 4 Appendix 5b

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Almond pH (standard units) 4.7 7.1 7.8 8.2 9.3 267 Formation of Calcium 0.5 21 45.9 135 4,640 258 the Mesaverde Group Magnesium 0.009 5 15 65.5 1,620 235 Potassium 1 16.5 35 71.3 1,880 175 Sodium-adsorption ratio 1.5 103 159 201 616 22 (unitless) Sodium 28 2,110 3,090 6,200 35,600 269 Bicarbonate 33 1,250 1,950 2,700 18,300 268 Carbonate 0.1 36.8 53.4 107 242 24 Chloride 9 2,090 3,950 8,420 57,500 268 Fluoride 0.03 ------0.1 2 Sulfate 1 15 40 173 4,750 237 Dissolved solids 115 6,010 9,600 18,100 95,300 269 Aluminum 90 ------1 Arsenic 10 10 30 100 2,170 5 Barium 500 3,000 7,840 16,600 46,000 80 Beryllium 10 ------1 Boron 10 -- 2,260 -- 3,300 3 Cadmium 10 10 10 20 30 7 Chromium 2 22.5 45 75 280 10 Copper 20 37.5 45 92.5 1,000 12 Iron 22 1,000 5,260 15,000 274,000 180 Lead 10 ------30 2 Lithium 150 -- 860 -- 1,460 3 Manganese 10 145 350 555 3,100 19 Mercury 40 ------1 Selenium 10 ------10 2 Strontium 8,820 ------45,700 2 Zinc 50 90 100 145 510 15

Ericson Sandstone pH (standard units) 4.2 7.4 8 8.3 9.1 21 of the Calcium 6 20 77 127 4,070 21 Mesaverde Group Magnesium 2 14 30.2 129 1,190 21 Potassium 36 425 612 3,000 7,030 6 Sodium 362 2,730 3,800 10,100 27,000 21 Bicarbonate 24 781 1,400 2,140 5,670 21 Carbonate 96 -- 548 -- 1,140 3 Chloride 60 2,420 5,100 19,600 41,000 21 Sulfate 3 66 199 783 6,000 21

10-121 Appendix 5b 5

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Ericson Sandstone Dissolved solids 1,020 6,730 14,100 32,500 74,500 21 of the Aluminum 2,800 ------1 Mesaverde Group— Barium 900 ------1 continued Iron 77,500 ------1 Manganese 400 ------1

Rock Springs pH (standard units) 5.6 7.2 7.8 8.5 8.7 8 Formation of Calcium 11 36.5 70 130 643 8 the Mesaverde Group Magnesium 3 15.5 47 61.8 115 8 Potassium 53 ------100 2 Sodium 2,800 4,520 7,080 11,500 59,700 8 Bicarbonate 110 1,870 2,060 3,330 7,400 8 Chloride 3,500 5,680 8,820 14,880 88,000 8 Sulfate 4 6.7 46 323 4,660 7 Dissolved solids 7,480 11,700 18,000 31,400 154,000 8 Iron 1,000 ------1

Haystack pH (standard units) 7.8 8 8.3 8.5 9.6 8 Mountains Calcium 9.3 13 18.7 51.6 222 8 Formation of the Mesaverde Magnesium 5 5.8 7.7 9.4 41 8 Group Potassium 12.6 13.3 16.9 31.6 37.2 6 Sodium-adsorption ratio 36.1 -- 183 -- 7,610 3 (unitless) Sodium 883 1,530 2,390 5,450 8,990 8 Bicarbonate 2,010 2,850 3,050 3,980 4,300 6 Carbonate 60.6 ------61 2 Chloride 114 208 1,840 7,000 15,400 8 Fluoride 2.8 ------6.5 2 Sulfate 12 17 30 45.9 831 7 Dissolved solids 2,480 3,770 5,890 14,600 32,300 8 Aluminum 20 -- 100 -- 6,920 3 Arsenic 20 ------1 Barium 20 305 1,710 14,000 47,000 4 Boron 900 ------1 Cadmium 20 ------1 Copper 10 -- 20 -- 100 3 Iron 172 445 5,920 8,350 15,400 7 Lead 20 ------30 2

10-122 6 Appendix 5b

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Haystack Lithium 200 ------1 Mountains Manganese 100 115 175 265 370 4 Formation of the Mesaverde Mercury 10 ------1 Group— Selenium 10 -- 50 -- 70 3 continued Zinc 50 ------520 2

Cody and Steele pH (standard units) 6.4 7.2 7.8 8.2 9.3 27 Shales Calcium 4 27 101 296 491 27 Magnesium 1 23 37 76.5 134 27 Potassium 7 50 206 385 760 24 Sodium 941 4,980 7,920 10,500 17,900 27 Bicarbonate 272 695 1,340 2,250 4,720 27 Chloride 180 9,300 12,200 14,700 28,800 27 Sulfate 2 31.3 66 137 453 22 Dissolved solids 2,270 13,600 22,200 26,200 45,600 23 Aluminum 60 ------1 Barium 190 240 15,500 37,800 42,000 5 Iron 90 1,140 4,540 10,000 85,000 17 Manganese 20 27.5 70 130 190 4 Zinc 30 482 615 1,400 2,910 6

Niobrara pH (standard units) 7.2 ------7.7 2 Formation Calcium 331 ------414 2 Magnesium 97.8 ------105 2 Potassium 57.7 ------104 2 Sodium 11,400 ------12,300 2 Bicarbonate 313 ------702 2 Chloride 18,800 ------20,800 2 Sulfate 15 ------36 2 Dissolved solids 29,500 ------31,100 2 Iron 50 ------132,000 2

Frontier pH (standard units) 6.2 7.1 7.9 8.4 9 21 Formation Calcium 2 11 194 450 4,300 21 Magnesium 1 5.8 41.5 138 700 20 Potassium 6 37.5 78 136 225 16 Sodium-adsorption ratio 511 ------1 (unitless) Sodium 553 3,600 5,300 11,600 19,500 21

10-123 Appendix 5b 7

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Frontier Bicarbonate 281 573 1,170 2,620 6,060 21 Formation— Carbonate 251 ------312 2 continued Chloride 24 2,340 8,350 18,400 38,000 21 Sulfate 11 27.8 54 104 546 18 Dissolved solids 1,330 7,940 14,400 30,800 62,100 21 Iron 250 ------7,000 2

Muddy Sandstone pH (standard units) 7.1 7.6 7.8 8.1 8.5 4 and Calcium 11 38 71 149 311 4 Thermopolis Shale Magnesium 8 14.8 20.5 30.5 50 4 Potassium 15 38.3 46 59.8 101 4 Sodium 110 1,560 3,540 6,190 9,620 4 Bicarbonate 120 488 762 1,600 3,660 4 Chloride 71 595 4,140 9,420 15,200 4 Sulfate 41 82.3 178 265 276 4 Dissolved solids 596 3,900 9,100 16,300 25,700 4

Cloverly pH (standard units) 6 7.6 8 8.4 8.8 20 Formation Calcium 1 17 44 86 560 21 Magnesium 4 12 18 41.5 54 17 Potassium 16 20 63 103 160 9 Sodium 134 1,290 2,430 3,550 9,840 22 Bicarbonate 73.2 812 1,780 3,320 5,710 22 Carbonate 47.6 ------312 2 Chloride 42 948 1,970 3,850 15,400 22 Sulfate 7 40.6 120 171 2,450 18 Dissolved solids 426 3,410 6,480 9,450 26,200 22 Iron 60 3,800 11,300 14,000 42,500 5

Morrison pH (standard units) 6.7 ------8.5 2 Formation Calcium 84 ------488 2 Magnesium 30 ------51 2 Potassium 332 ------500 2 Sodium 9,330 ------9,360 2 Bicarbonate 720 ------3,950 2 Chloride 6,300 ------14,200 2 Sulfate 1,400 ------8,500 2 Dissolved solids 26,100 ------27,000 2

10-124 8 Appendix 5b

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Sundance pH (standard units) 5.9 7 7.4 7.4 7.7 5 Formation Calcium 40 73 216 358 555 6 Magnesium 5 7.3 33 64.8 186 6 Potassium 49 ------339 2 Sodium 1,160 1,360 2,920 11,247 14,480 6 Bicarbonate 300 802 1,000 1,730 2,520 6 Chloride 766 1,740 4,540 16,769 23,200 6 Sulfate 21 54 136 206 1,593 6 Dissolved solids 3,230 4,670 8,040 29,900 39,200 6 Iron 11,000 ------1

Nugget Sandstone pH (standard units) 6 6.7 7.8 8.4 8.9 24 Calcium 10 36 112 520 1,030 25 Magnesium 5 8.4 51.5 99.5 317 24 Potassium 25 69 192 612 2,300 12 Sodium 255 1,520 3,880 18,500 35,300 25 Bicarbonate 183 796 1,250 2,890 6,950 24 Carbonate 72 ------1 Chloride 123 780 4,800 30,000 50,000 25 Sulfate 8 712 1,500 3,690 5,500 22 Dissolved solids 894 3,790 10,300 51,900 95,300 25 Iron 10,500 17,000 65,000 79,000 206,000 5

Chugwater pH (standard units) 6.5 ------1 Formation or Calcium 420 ------1 Group Magnesium 140 ------1 Potassium 140 ------1 Sodium 2,480 ------1 Bicarbonate 1,550 ------1 Chloride 4,200 ------1 Dissolved solids 8,140 ------1

10-125 Appendix 5b 9

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Paleozoic hydrogeologic units Phosphoria pH (standard units) 8.8 ------1 Formation Calcium 271 ------1 Magnesium 3 ------1 Potassium 23 ------1 Sodium 1,410 ------1 Bicarbonate 195 ------1 Chloride 40 ------1 Sulfate 3,400 ------1 Dissolved solids 5,260 ------1

Tensleep pH (standard units) 6.4 7.2 7.6 7.9 8.6 52 Sandstone Calcium 3 308 406 526 1,620 64 Magnesium 2 54.5 79 107 836 63 Potassium 5 64.2 260 390 2,800 29 Sodium 47 1,110 3,090 4,800 34,800 64 Bicarbonate 65 333 890 1,890 6,690 64 Chloride 10 1,060 2,840 5,730 55,000 64 Sulfate 18.5 1,640 2,570 3,440 6,830 63 Dissolved solids 1,980 4,970 10,400 15,000 94,800 64 Iron 50 ------1

Weber Sandstone pH (standard units) 8.1 ------1 Calcium 283 ------480 2 Magnesium 40 ------78.1 2 Potassium 1,600 ------1 Sodium 32,700 ------37,600 2 Bicarbonate 2,620 ------5,510 2 Chloride 47,500 ------50,000 2 Sulfate 3,500 ------9,400 2 Dissolved solids 86,900 ------102,000 2 Iron 38,800 ------1

Amsden pH (standard units) 6.7 7.1 7.4 7.8 8.2 4 Formation Calcium 299 366 394 405 421 4 Magnesium 29 41 46 53.3 72 4 Sodium 1,620 2,050 3,810 5,520 5,820 4 Bicarbonate 639 934 1,610 2,280 2,560 4 Chloride 1,540 1,840 2,990 4,060 4,120 4 Sulfate 2,010 2,270 3,520 4,970 5,830 4 Dissolved solids 5,950 7,080 11,600 16,200 17,400 4

10-126 10 Appendix 5b

Appendix 5b. Summary statistics for produced water samples, Great Divide/Washakie/Sand Wash Basins, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter unless otherwise noted; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size

Madison pH (standard units) 4.4 7.4 7.7 7.9 8.6 22 Limestone Calcium 54 262 396 538 6,340 27 Magnesium 9 39.5 75 98.5 845 26 Potassium 113 143 164 281 1,760 12 Sodium 302 1,490 2,840 3,910 11,900 27 Bicarbonate 131 473 587 866 1,860 25 Chloride 162 1,800 3,240 4,800 33,400 27 Sulfate 85 1,700 2,130 2,480 4,200 27 Dissolved solids 1,200 5,970 9,490 12,800 54,500 27 Iron 4,000 ------1

Undifferentiated pH (standard units) 6.9 7.3 8 8.1 8.6 8 Cambrian rocks Calcium 165 229 430 910 2,030 9 Magnesium 14 26 51 120 229 9 Potassium 30 154 180 290 305 5 Sodium 1,170 2,890 3,980 7,260 10,500 9 Bicarbonate 138 247 268 465 1,560 8 Chloride 1,130 3,290 7,620 9,500 19,100 9 Sulfate 690 1,460 1,810 2,380 3,010 9 Dissolved solids 3,900 9,330 13,700 20,200 33,500 9

Flathead pH (standard units) 7.2 8 8 8.3 8.4 6 Sandstone Calcium 247 427 438 574 1,160 6 Magnesium 6 17.8 29 34.3 46 6 Potassium 34 298 330 392 440 6 Sodium 1,060 3,440 3,920 4,570 5,190 6 Bicarbonate 110 192 250 290 293 6 Chloride 730 4,700 5,450 6,800 9,400 6 Sulfate 1,360 1,880 2,120 2,140 2,180 6 Dissolved solids 3,930 11,200 12,500 14,700 17,700 6

10-127 Appendix 5c 1

Appendix 5c. Summary statistics for produced water samples, Rock Springs Uplift, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic code Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesozoic hydrogeologic units Almond pH (standard units) 8.8 ------1 Formation of Calcium 10 ------1 the Mesaverde Group Magnesium 8 ------1 Potassium 195 ------1 Sodium 5,160 ------1 Bicarbonate 2,740 ------1 Carbonate 156 ------1 Chloride 5,360 ------1 Sulfate 16 ------1 Dissolved solids 12,300 ------1

Rock Springs pH (standard units) 8.4 ------1 Formation of Calcium 16 ------1 the Mesaverde Group Magnesium 7 ------1 Potassium 50 ------1 Sodium 783 ------1 Bicarbonate 1,790 ------1 Chloride 76 ------1 Sulfate 133 ------1 Dissolved solids 2,020 ------1

Blair Formation pH (standard units) 7.9 ------8.9 2 of the Calcium 35 ------44 2 Mesaverde Group Magnesium 21 ------25 2 Potassium 36 ------60 2 Sodium 17,700 ------18,800 2 Bicarbonate 1,960 ------2,290 2 Chloride 25,600 ------27,600 2 Sulfate 90 ------570 2 Dissolved solids 45,000 ------48,000 2

Baxter Shale pH (standard units) 7.9 ------1 Calcium 416 ------1 Magnesium 102 ------1 Sodium 8,470 ------1 Bicarbonate 508 ------1 Chloride 13,800 ------1 Sulfate 7 ------1 Dissolved solids 23,300 ------1

10-128 2 Appendix 5c

Appendix 5c. Summary statistics for produced water samples, Rock Springs Uplift, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic code Constituent Minimum 25th percentile Median 75th percentile Maximum size Frontier pH (standard units) 7 7.6 8.1 8.3 8.8 27 Formation Calcium 11 55 98 210 1,060 29 Magnesium 5 34 57.5 137 344 28 Potassium 7 43 57 88.8 300 18 Sodium 1,460 6,500 12,600 17,000 24,200 29 Bicarbonate 330 854 2,580 4,880 10,490 29 Carbonate 19 ------1 Chloride 450 8,250 15,600 27,600 37,600 29 Sulfate 4 21 45 132 3,490 21 Dissolved solids 3,830 16,500 31,800 45,900 65,400 29 Iron 20,300 ------1

Cloverly pH (standard units) 5.6 7.2 7.9 8.3 8.9 30 Formation Calcium 2 45.5 110 216 1,740 31 Magnesium 7 19.8 63 108 294 28 Potassium 1 25.5 66 162 354 15 Sodium 6 4,090 7,550 9,770 36,200 31 Bicarbonate 31 1,010 2,050 3,320 13,900 31 Chloride 2 3,750 9,000 13,700 54,000 31 Sulfate 5 41 77 291 6,300 29 Dissolved solids 32 10,500 20,300 25,200 98,500 31

Morrison pH (standard units) 6.5 7.8 8.2 8.6 8.6 15 Formation Calcium 9 51.8 124 251 653 16 Magnesium 5 22.5 51.5 72.3 228 16 Potassium 15 21.5 53 147 1,000 11 Sodium 777 2,980 6,660 8,670 14,800 16 Bicarbonate 293 669 1,340 1,480 5,770 16 Chloride 340 3,120 10,200 12,900 23,000 16 Sulfate 5 119 409 830 4,280 16 Dissolved solids 2,160 7,850 18,900 22,800 40,800 16

Sundance pH (standard units) 7 7.3 7.5 8.1 8.5 7 Formation Calcium 23 53.8 75 324 636 10 Magnesium 19 28.3 31.5 111 306 10 Sodium 3,630 4,890 5,880 7,640 12,600 10 Bicarbonate 405 1,900 2,980 4,140 5,700 10 Chloride 3,700 4,470 5,720 6,960 17,200 10 Sulfate 10 430 970 4,290 9,950 10 Dissolved solids 9,470 12,400 16,900 22,300 37,400 10

10-129 Appendix 5c 3

Appendix 5c. Summary statistics for produced water samples, Rock Springs Uplift, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic code Constituent Minimum 25th percentile Median 75th percentile Maximum size

Nugget Sandstone pH (standard units) 7 7.7 8 8 8.3 12 Calcium 17 51 90 111 229 21 Magnesium 20 28.5 37 41.3 51 20 Potassium 140 ------1,550 2 Sodium 1,610 3,780 3,990 4,620 34,900 21 Bicarbonate 1,160 3,800 4,490 4,900 6,000 21 Chloride 1,120 3,430 3,700 3,980 42,000 21 Sulfate 9 59.5 290 674 14,500 19 Dissolved solids 5,000 9,110 10,200 11,800 95,700 21

Chugwater Calcium 47 ------1 Formation or Magnesium 26 ------1 Group Sodium 2,160 ------1 Bicarbonate 2,090 ------1 Chloride 2,110 ------1 Sulfate 231 ------1 Dissolved solids 5,600 ------1

Paleozoic hydrogeologic units Phosphoria pH (standard units) 7.2 -- 7.2 -- 7.3 3 Formation Calcium 29 242 624 886 916 6 Magnesium 71 87.3 158 249 270 6 Potassium 549 -- 570 -- 581 3 Sodium 1,560 4,120 4,650 4,710 5,630 6 Bicarbonate 979 1,450 2,100 2,980 3,700 6 Chloride 188 2,200 6,230 9,220 9,600 6 Sulfate 1,520 1,530 1,670 3,740 4,470 6 Dissolved solids 5,500 13,800 16,600 17,700 18,200 6 Iron 48,200 -- 120,000 -- 266,000 3

Tensleep Calcium 528 598 772 1,000 1,240 4 Sandstone Magnesium 101 -- 209 -- 296 3 Sodium 3,730 3,790 7,210 11,900 15,600 4 Bicarbonate 2,100 -- 3,060 -- 3,550 3 Chloride 4,520 4,840 10,320 17,700 23,800 4 Sulfate 697 1,170 1,620 1,930 1,980 4 Dissolved solids 12,600 12,800 23,000 35,600 42,600 4

10-130 4 Appendix 5c

Appendix 5c. Summary statistics for produced water samples, Rock Springs Uplift, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic code Constituent Minimum 25th percentile Median 75th percentile Maximum size Weber Sandstone pH (standard units) 7.6 ------8.1 2 Calcium 21 222 550 852 973 4 Magnesium 5 141 236 307 370 4 Sodium 1,300 4,530 8,390 15,000 26,600 4 Bicarbonate 476 1,630 2,260 2,640 3,050 4 Chloride 1,620 5,530 11,600 22,600 41,000 4 Sulfate 210 1,180 1,830 2,200 2,330 4 Dissolved solids 3,390 12,800 24,600 43,100 72,300 4

Morgan pH (standard units) 6.9 ------7.1 2 Formation Calcium 1,140 ------1,910 2 Magnesium 156 ------363 2 Sodium 13,200 ------31,000 2 Bicarbonate 2,560 ------3,150 2 Chloride 18,000 ------49,000 2 Sulfate 1,900 ------4,540 2 Dissolved solids 38,300 ------85,700 2

Round Valley pH (standard units) 6.8 ------1 Limestone Calcium 741 ------1 Magnesium 190 ------1 Sodium 33,600 ------1 Bicarbonate 5,550 ------1 Chloride 47,000 ------1 Sulfate 4,650 ------1 Dissolved solids 88,900 ------1

10-131 Appendix 5d 1

Appendix 5d. Summary statistics for produced water samples, Overthrust Belt, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Mesozoic hydrogeologic units Adaville Calcium 40.7 ------63.9 2 Formation Magnesium 19.1 ------49 2 Potassium 8.6 ------26.7 2 Sodium-adsorption ratio 1.1 ------1.5 2 (unitless) Sodium 35.3 ------63.6 2 Bicarbonate 235 ------368 2 Chloride 5.1 ------118 2 Sulfate 70.6 ------82.1 2 Dissolved solids 279 ------563 2 Barium 90 ------140 2 Boron 430 ------530 2 Copper 10 ------1 Iron 363 ------2,930 2 Manganese 130 ------180 2 Nickel 40 ------1 Zinc 10 ------190 2

Frontier pH (standard units) 7.1 7.6 7.7 8 8.2 9 Formation Calcium 11 54.3 86.5 126 438 10 Magnesium 2 7 11 22 69.6 9 Potassium 1.3 9.8 29.5 51.8 750 8 Sodium-adsorption ratio 0.2 ------7.5 2 (unitless) Sodium 5.4 666 3,380 4,110 24,800 10 Bicarbonate 126 500 1,080 1,440 2,400 10 Chloride 22.4 790 4,480 5,820 37,800 10 Fluoride 0.8 ------1 Sulfate 10 20 40 300 1,290 9 Dissolved solids 148 2,320 9,110 10,600 65,900 10 Aluminum 10 ------130 2 Boron 540 ------1 Iron 98 ------726 2 Manganese 10 ------120 2 Zinc 10 ------1

10-132 2 Appendix 5d

Appendix 5d. Summary statistics for produced water samples, Overthrust Belt, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Muddy Sandstone pH (standard units) 6.4 -- 6.7 -- 8.7 3 Member of Calcium 316 -- 462 -- 2,200 3 Thermopolis Shale Magnesium 23 ------43 2 Potassium 72 -- 130 -- 700 3 Sodium 7,280 -- 8,800 -- 24,400 3 Bicarbonate 671 -- 964 -- 1,510 3 Chloride 11,600 -- 17,300 -- 36,600 3 Sulfate 34 -- 36 -- 1,420 3 Dissolved solids 20,000 -- 28,800 -- 64,400 3

Cloverly pH (standard units) 6.8 6.8 7.2 7.4 8.7 5 Formation Calcium 10 12 133 259 2,830 5 Magnesium 2.4 3 3.6 41 157 5 Potassium 22 -- 28 -- 368 3 Sodium 922 1,640 2,320 6,300 7,300 5 Bicarbonate 85 329 622 866 891 5 Carbonate 18 ------1 Chloride 1,580 1,990 2,990 9,900 16,300 5 Sulfate 80 83.4 93 271 780 4 Dissolved solids 2,700 4,600 6,330 16,900 27,900 5 Iron 2,100 ------14,100 2

Nugget Sandstone pH (standard units) 5.8 6.8 7 7.2 8.1 13 Calcium 330 457 467 1,810 2,790 13 Magnesium 36 49 68 183 257 13 Potassium 113 127 216 1,700 2,000 10 Sodium 2,230 4,700 5,320 30,000 36,500 13 Bicarbonate 73 244 268 378 439 13 Chloride 1,350 5,600 6,700 50,800 61,000 13 Sulfate 820 1,080 3,280 3,450 3,740 13 Dissolved solids 7,870 14,500 16,300 85,800 102,000 13

10-133 Appendix 5d 3

Appendix 5d. Summary statistics for produced water samples, Overthrust Belt, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Paleozoic hydrogeologic units Thaynes pH (standard units) 8.3 ------8.4 2 Limestone Calcium 976 ------1,190 2 Magnesium 165 ------380 2 Potassium 100 ------120 2 Sodium 8,190 ------10,600 2 Bicarbonate 647 ------683 2 Chloride 8,600 ------15,400 2 Sulfate 5,020 ------8,010 2 Dissolved solids 26,400 ------33,200 2

Phosphoria pH (standard units) 6.1 6.6 7.1 7.4 7.5 4 Formation Calcium 442 516 621 1,550 4,080 4 Magnesium 32 72.5 120 236 486 4 Potassium 5 ------1 Sodium 125 136 194 25,400 101,000 4 Bicarbonate 305 488 1,160 1,810 1,890 4 Chloride 4 82 114 42,300 169,000 4 Sulfate 435 1,050 1,290 1,480 1,950 4 Dissolved solids 2,330 2,460 2,720 71,300 276,000 4

Tensleep pH (standard units) 8.1 -- 8.2 -- 8.6 3 Sandstone Calcium 43 -- 247 -- 965 3 Magnesium 44 -- 110 -- 162 3 Sodium 3,860 -- 5,280 -- 7,280 3 Bicarbonate 1,810 -- 1,830 -- 2,320 3 Chloride 1,100 -- 1,360 -- 1,850 3 Sulfate 4,850 -- 9,660 -- 13,300 3 Dissolved solids 11,200 -- 19,100 -- 23,000 3

Madison pH (standard units) 7.4 -- 7.9 -- 8.5 3 Limestone Calcium 80 -- 241 -- 577 3 Magnesium 18 -- 97 -- 135 3 Potassium 2 ------517 2 Sodium 113 -- 6,860 -- 8,670 3 Bicarbonate 268 -- 1,020 -- 5,100 3 Carbonate 120 ------1 Chloride 14 -- 1,000 -- 3,800 3 Sulfate 1,930 -- 9,930 -- 12,900 3 Dissolved solids 2,900 -- 22,000 -- 25,300 3

10-134 4 Appendix 5d

Appendix 5d. Summary statistics for produced water samples, Overthrust Belt, Wyoming. —Continued

[--, not applicable. Values in black are in milligrams per liter; values in blue are in micrograms per liter]

Sample Geologic unit Constituent Minimum 25th percentile Median 75th percentile Maximum size Bighorn Dolomite pH (standard units) 6.6 -- 7.2 -- 7.3 3 Calcium 386 -- 938 -- 1,250 3 Magnesium 35 -- 81 -- 202 3 Sodium 145 -- 610 -- 10,700 3 Bicarbonate 1,330 -- 4,270 -- 5,750 3 Chloride 100 -- 230 -- 12,700 3 Sulfate 183 -- 1,400 -- 3,210 3 Dissolved solids 1,500 -- 5,790 -- 30,500 3

10-135