GEOLOGICAL SURVEY a division of Utah Department of Natural Resources in cooperation with Plate 1 National Park Service Utah Geological Survey Miscellaneous Publication 07-2 and Brigham Young University Department of Geological Sciences Geologic Map of the Fruita Quadrangle

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Base map from U.S. Geological Survey Field mapping by authors, 2005 Fruita 7.5' quadrangle, 1987 SCALE 1:24,000 GIS Analyst, J. Buck Ehler and Darryl Greer Geologic data and base map in NAD 1927 1 1/2 0 1 MILE Cartographer, Lori J. Douglas Shaded topography generated from digital elevation data Project Manager, Grant C. Willis 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET ISBN 1-55791-773-6 Research suported by the National Parks Service, under NPS Grant #P2360032216 Key access roads, selected trails, and prominent and the U.S. Geological Survey National 1 .5 0 1 KILOMETER features in and near Capitol Reef National Park Cooperative Geologic Mapping Program under shown in brown. Condition and status of roads and trails may change over time. Some not shown. EDMAP Award #03HQAG0003. The views and CONTOUR INTERVAL 40 FEET conclusions contained in this document are those of From data provided by National Park Service. the authors and should not be interpreted as 12° 6' necessarily representing the official policies, either UTAH expressed or implied, of the U.S. Government.

The Utah Department of Natural Resources, Utah GEOLOGIC MAP OF THE FRUITA QUADRANGLE, Geological Survey, makes no warranty, expressed 2007 MAGNETIC DECLINATION QUADRANGLE LOCATION or implied, regarding the suitability of this product AT CENTER OF SHEET WAYNE COUNTY, UTAH for a particular use. The Utah Department of Natural Resources, Utah Geological Survey, shall 321 1 Cathedral Mountain not be liable under any circumstances for any 2 Fruita NW direct, indirect, special, incidental, or consequential by 3 Caine Springs 4 Twin Rocks damages with respect to claims by users of this 4 5 product. 5 Caineville 1 1 2 6 Grover Briana T. McLelland , Thomas H. Morris , Daniel H. Martin , 7 The Miscellaneous Publication series provides 6 7 8 8 Notom non-UGS authors with a high-quality format for 3 documents concerning Utah geology. Although and Samuel C. Sorber review comments have been incorporated, this ADJOINING 7.5' QUADRANGLE NAMES publication does not necessarily conform to UGS technical, policy, or editorial standards. 2007 Utah Geological Survey, 1594 W. North Temple, P.O. Box 146100, Salt Lake City, Utah 84114-6100. Phone: 801-537-3300; fax 801-537-3400; 1Brigham Young University, Department of Geological Sciences, Provo, Utah geology.utah.gov 2Fronterra Geosciences, 5100 North Brookline Ave., Oklahoma City, Oklahoma 3ExxonMobil Exploration Company, Houston, Texas UTAH GEOLOGICAL SURVEY Plate 2 a division of Utah Geological Survey Miscellaneous Publication 07-2 Utah Department of Natural Resources Geologic Map of the Fruita Quadrangle in cooperation with National Park Service and Brigham Young University Department of Geological Sciences

Volcanic Boulder-Covered Strath Terraces and Landscape Evolution DESCRIPTION OF MAP UNITS Jk Kayenta Formation (Lower Jurassic) – Moderate-reddish-brown to moderate- Volcanic Boulder-covered Strath Terraces within the Glen Canyon Group QUATERNARY DEPOSITS reddish-orange, irregularly bedded, very fine to coarse-grained sandstone and Section of the Canyon - from Eddleman (2005) siltstone. Forms stepped topography composed of ledges (locally cliffs) and Boulder-covered strath terraces are dominant landforms carved into Figure A FrFemoremonnt Rti vReriTveerrra cTeeDrartaace Data Alluvial and floodplain deposits – Poorly to moderately sorted material in slopes. The upper approximately 100 feet (30 m) was mapped by Sorber and Qal the relatively resistant bedrock of the Fremont River drainage. These fluvial modern streams and rivers. Includes clay- to boulder-size sediments others (2006) and Doelling and Kuehne (2005) as the basal member of the 12 Qatf composed of mudstone, siltstone, sandstone, and limestone. Includes low within the adjacent Twin Rocks quadrangle where the terraces and their associated boulder deposits at one time represented the active 3 terrace deposits up to 10 feet (3m) above the active channel. 0-10 feet (0-3 eolian nature is more prominent. 300-400 feet (90-120 m) thick. river floor, but have since been abandoned. These terraces help to preserve m) thick. stream bed histories and create an ideal surface with which to characterize JURASSIC - TRIASSIC ROCKS overall drainage development. Qatf2 Alluvial and floodplain deposits of a former river level – Located 10-20 feet Qal2 Glacial influence on landscape and drainage morphology has been (3-6 m) above current floodplain. Clay- to boulder-size sediments composed Wingate Sandstone (Lower Jurassic to Triassic[?]) – Light brown to moderate significant within the Fremont River and surrounding drainages. Research JTRw Qatf of mudstone, siltstone, sandstone, and limestone. 0-20 feet (0-6 m) thick. reddish-brown, cross-bedded to apparently massive, very fine to fine-grained suggests that strath terrace development (widening of the floodplain) and 4 deposition occurred as the Fremont River responded to dramatic increases in Qae Alluvial-eolian deposits – Alluvium that has been subsequently reworked by sandstone. Forms the sheer cliffs of the western escarpment of the Qatf5 eolian processes to form small surficial eolian deposits (dunes and ripples). . Walls are highly fractured and commonly covered with discharge and sediment flux during glacial maxima/deglacial climate phases. Qatf Qatfu Commonly associated with exposed point bars of Deep Creek. Eolian black to dark-brown desert varnish. 350-400 feet (105-120 m) thick. Incision and subsequent abandonment of strath terraces began as drainages 1

sediments are well sorted and composed of silt to medium-grained sand. 0-10 responded to continued waning discharge (due to glacial retreat) and an overall Number of Terraces feet (0-3 m) thick. TRIASSIC ROCKS decrease in sediment during deglacial/interglacial climate phases. Strath terrace populations were analyzed in an attempt to understand Qe Eolian deposits – Very well sorted, well-rounded, very fine to fine wind-blown TRco Owl Rock Member of the Chinle Formation (Upper Triassic) – Orange and landscape evolution. Terraces were placed into 20-foot. bins and then grouped sand. Occurs between domes of the Navajo Sandstone. 0-10 feet (0-3 m) purple mudstone, siltstone, and sandstone with 1-3 foot (0.3-1 m) thick into larger terrace levels based on natural breaks in population data (occurring in thick. interbeds of mottled dusky-red to pale-yellowish-green limestone (interpreted intervals of approximately 60-80 feet) that display multiple modes. Results for to represent paleosols) containing abundant rhizoliths and bioturbated Qmt Talus deposits – Mass-movement talus deposits of rockfalls, rockslides, and the Fremont River were plotted (figure A) and six terrace levels, labeled Qatf1 slumps. Composed of clay- to boulder-size particles. Commonly found horizons. Forms a steep slope. Unit is commonly covered by talus deposits through Qatf and Qatfu respectively, were interpreted. An identical analysis 0 20 40 60 80 5 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 where an easily erodable rock layer is located directly under a more resistant of the overlying Wingate and Kayenta Sandstones. 180-220 feet (55-65 m) for the Pleasant Creek drainage (approximately 10 miles [16 km] to the south in Height above Fremont River (ft) rock layer. For example, talus deposits composed of resistant Wingate thick. the Golden Throne 7.5' quadrangle, Martin and others, 2006) yields similar Sandstone and Kayenta Formation sandstones overly the softer Owl Rock results and was used in a comparative analysis between drainages (figure B). TRcp Petrified Forest Member of the Chinle Formation (Upper Triassic) – Pleasant Creek Terrace Data Member of the Chinle Formation. 0-30 feet (0-9 m) thick. Moderate-reddish-brown mudstone and siltstone interbedded with carbonate A Schmidt Hammer is a piston impact device designed to measure the Figure B hardness of a surface. Surface hardness can provide a valuable measure of rock Volcanic boulder colluvial deposits – Predominantly composed of talus and nodule horizons, 2 feet (0.6 m) thick, interpreted to be paleosols. Contains 9 Qmtv surface weathering and therefore relative terrain age. A Schmidt Hammer was colluvial material weathering from nearby volcanic alluvial terrace deposits. petrified wood. The upper bed of the member consists of a locally extensive, Qatv2 used to obtain quantitative data (Schmidt Hammer rebound or R-values) on the Commonly includes large extrusive (basaltic to andesitic) igneous boulders. dark-reddish-brown, ledge-forming, medium- to coarse-grained, cross-bedded 8 These deposits may form pediments when overlying softer bedrock such as sandstone called the "Capitol Reef Bed." Most of the unit forms slopes. hardness of basalt boulder deposits on strath terraces. Schmidt Hammer results the Moenkopi Formation, Chinle Formation, , Entrada 180-200 feet (55-60 m) thick. indicate that elevation change between strath terraces is accompanied by a 7 Sandstone, and Morrison Formation. 0-5 feet (0-1.5 m) thick. coincident change in mean R-values wherein the higher the elevation of the TRcm Monitor Butte Member of the Chinle Formation (Upper Triassic) – terrace above the present stream bed, the lower the mean R-values become. 6 Light-olive-gray to greenish-gray, bentonitic claystone with thin dusky-brown Qat Old alluvial terrace deposits – Bedded sand- to boulder-size sediments Mean Schmidt Hammer data (table 1) confirms terrace level designations to dark-yellowish-orange, medium- to coarse-grained, cross-bedded, 5 Qatf overlying river-cut strath terraces. Consists of two main types of material of (figures A and B) for both the Fremont River and Pleasant Creek drainages. channelized sandstone beds. Forms a slope. 150-200 feet (45-60 m) thick. Qatf1 which one or both may be present. One type is composed mainly of large Schmidt Hammer data also highlight very similar mean R-values for the most igneous boulders (basaltic to andesitic composition) with smaller amounts of 4 Qatf2 Shinarump Member of the Chinle Formation (Upper Triassic) – recent terrace levels of both drainages (table 1). Number Of Terraces TRcs Qatbv Qatf3 lighter colored sand- to silt-size sediment. The other type of terrace material Results, based on terrace populations and Schmidt Hammer analysis, 1 Grayish-orange to very-pale-orange, medium- to very coarse grained, 3 Qatf4 is made of light peach-colored sand- to cobble-size sediment from locally cross-bedded conglomeratic sandstone. Contains petrified wood. Shinarump indicate that the larger Fremont River drainage is likely much older than the Qatf5 derived bedrock. Where both of these deposits are present, the igneous beds are discontinuous due to its braided fluvial depositional history. The Pleasant Creek drainage. Data, also supports the conclusion that correlation 2 Qatfu boulder material is found below the locally derived material. Each terrace basal unconformable contact is scoured with 0-5 feet (0-1.5 m) of relief. The exists between the two lowest (most recent) terrace levels within the Fremont Qatd1 has been designated as follows: member contains uranium and has been historically prospected within the River (Qatf1 and Qatf2) and the Pleasant Creek terraces (Qatv1 and Qatv2). This 1 Qatdu Qatf - Terraces associated with the Fremont River drainage. Qatf1 represents quadrangle. Forms ledges and cliffs. 0-20 feet (0-6 m) thick. correlation is significant and illustrates that the root cause of drainage Qatpu the youngest terraces, with Qatf , Qatf , Qatf , and Qatf representing 2 3 4 5 development and incision may be a forcing mechanism that is extrabasinal in 0 consecutively older terraces at higher elevations above the present riverbed. Moody Canyon Member of the Moenkopi Formation (Lower Triassic) – 0 20 40 60 80 TRmm nature. We suggest that the most probable forcing mechanism was regional 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 Qatf represents deposits 0-60 feet (0-18 m) above the present stream level, Moderate-reddish-brown to moderate-reddish-orange, laminated mudstone 1 Pleistocene glacial-interglacial climate cycles. Height above Pleasant Creek (ft) Qatf - 60-120 feet (18-37 m), Qatf - 120-180 feet (37-55 m), Qatf - and siltstone with sparse, fine-grained, ripple-laminated sandstone beds. 2 3 4 180-240 feet (55-73 m), and Qatf5 - 240-320 feet (73-98 m). (Eddleman, Gypsum-filled fractures and bedding-parallel stringers are common. 2005). Qatfu are sparse undifferentiated terraces associated with the Fremont Commonly forms a slope. Can be cliff-forming where overlain by the Table 1. Summary of strath terrace elevation and Schmidt hammer data for both the Pleasant Creek and Fremont River drainages. River drainage, and are older and higher in elevation than Qatf5. Shinarump Conglomerate. 250-300 feet (75-90 m) thick. Qatd1, Qatdu - Terraces associated with Deep Creek drainage. The numbering Torrey Member of the Moenkopi Formation (Lower Triassic) – Elevation Above Mean Schmit Elevation Above Mean Schmidt TRmt Fremont Terrace Hammer Pleasant Creek Current Hammer for these terraces uses the same method as mentioned above for the Fremont Moderate-reddish-brown to moderate-reddish-orange mudstone, siltstone, Current River terraces. However, the data for these terraces suggest only two Profiles Stream Bed R-Values Profiles Stream Bed R-Values and very fine to medium-grained sandstone. Bedding thickness ranges from 111°30' 111°15' 111° 110°45' different terrace names: Qatd1 and Qatdu (undifferentiated terraces associated 1-15 feet (0.5-5 m). Contains “ripple rock” and reptilian trackways. Forms Qatfu >381 ft. 33.59 with Deep Creek). The Qatdu terraces are sparse, much higher in elevation, ledges and slopes. 200-220 feet (60-65 m) thick. and older than the Qatd terraces. Qatfu 340-380 ft. 37.66 15 1 38°30' Fruita Qatpu - Undivided terraces associated with Pleasant Creek drainage. These Sinbad Limestone Member of the Moenkopi Formation (Lower Triassic) – Cathedral Valley TRms Quadrangle Salt UTAH Very-pale-orange to grayish-orange limestone and dolostone with interbeds Qatf5 241-320 ft. 39.22 Lake terraces are associated with the Pleasant Creek drainage because of their City 6 proximity to it. of calcareous siltstone, sandstone, and algal boundstones. Upper bed 89 Qatf 181-240 ft. commonly contains oolitic grains with rare bivalves. Forms a cliff. 40-70 4 39.30 Caineville 70 24 Old locally derived terrace deposits – Terrace deposits not clearly associated N.P. 24 Qatlo feet (12-20 m) thick. 191 Qatf3 121-180 ft. 44.87 Visitor with any of the present perennial drainages. Clay- to boulder-size particles of 24 15 24 Center 12 95 mudstone, siltstone, sandstone, and limestone derived from local, Black Dragon Member of the Moenkopi Formation (Lower Triassic) – Torrey TRmb Qatf 61-120 ft. 46.55 Qatv 61-140 ft. 45.01 89 Shown in cross-section only. 2 2 38°15' non-volcanic sources. Deposits are elevated significantly above present Notom streambeds. Located in the southwest corner of the quadrangle. 5-30 feet Qatf <60 ft. 52.46 Qatv <60 ft. 50.02 (1.5-9 m) thick. PALEOZOIC ROCKS 1 1 Twin Rocks 4-wheel drive Present Present Quadrangle Unpaved road TERTIARY ROCKS Pu Paleozoic rocks undifferentiated. (cross section) Pleasant Paved road Creek Capitol Reef National Park Paved highway Ti Intrusive igneous dikes – Dark-gray, near-vertical dikes of trachybasalt and Golden 38° basanite composition. Some are locally brecciated, containing a mixture of LITHOLOGIC COLUMN 12 Throne igneous material and host rock. The average dike width is approximately 3 Quadrangle N Boulder feet (1 m). The width of the dikes is slightly exaggerated on the map, and THICKNESS MAP SYSTEM FORMATION LITHOLOGY ENVIRONMENT may contain adjacent host rock that has been altered by the intrusion. Dikes SYMBOLS feet (m) SYMBOL Road are generally wider in the middle and thin on the ends. Ages of the intrusions Trail Waterpocket fold Burr range from 3.4 ± 0.2 Ma to 4.7 ± 0.3 Ma (Delaney and Gartner, 1997; Nelson Contacts and Tingey, 1997). Doelling and Kuehne (2005) dated dikes at 4.35 ± 0.04 Tununk Member 330-500 (100-150) Kmt marine Burr

40 39 Shale 38°45'

Fault - bar and ball on downthrown block; dashed where approximate, dotted Mancos Ma ( Ar/ Ar). Trail where covered 0 10 20 Miles

Road CRETACEOUS ROCKS Dakota Sandstone 0-10 (0-3) Kd fluvial/marine 0 10 20 Kilometers Anticline - showing anticlinal axis and direction of plunge Mussentuchit Member 0-30 (0-10) Kcm lacustrine/fluvial Tununk Member of the Mancos Shale (Upper Cretaceous) – Medium- to Ruby Ranch Member 0-60 (0-20) Kcr Fm. Kmt Mtn. Cedar dark-gray to bluish bentonitic shale. Near the base and top, the shale may be Syncline - showing synclinal axis and direction of plunge C E O U S A C R E T Buckhorn Cg. Member 0-50 (0-15) Kcb fluvial Location of Fruita Quadrangle in Capitol Reef National Park. yellowish- to greenish-gray and may include mudstone, siltstone, and very 10 Strike and dip of bedding Brushy Basin lacustrine/ fine grained sandstone. The pelecypod Mytiloides mytiloides is found in the 200-360 (60-110) Jmb lower middle part of the Tununk Member. Forms a broad slope. Exposed in Member fluvial the Fruita quadrangle in the center of the doubly plunging syncline in North A A' Line of cross section Morrison Blue Flats. 330-500 feet (100-150 m) thick. Formation Salt Wash Member 100-200 (30-60) Jms fluvial 5000 Structural contours - drawn on the top of the Wingate Sandstone; dashed where Kd Dakota Sandstone (Lower Cretaceous) – Tan to brownish-gray, very fine to projected; units are feet above sea level; contour interval: 500 feet Tidwell Member 15-30 (5-10) Jmt fine-grained, quartz-rich sandstone to siltstone/mudstone. May contain thin Summerville Formation 130 (40) Js tidal flat units of weathered interbedded coal, carbonaceous shale, and conglomerate. Joints (only prominent shown) Thick sandstone beds may contain oysters. Channel sandstones look similar Curtis Formation 80 (25) Jcs marine to those in the Mussentuchit Member of the Cedar Mountain Formation. erg margin Forms ledges and slopes. 0-10 feet (0-3 m) thick. Entrada Sandstone 430-490 (130-150) Je tidal flat Mussentuchit Member of the Cedar Mountain Formation (Lower Kcm Upper Winsor Mbr. 180-200 (55-60) Jcwb Cretaceous) – Light-gray to greenish-gray smectitic mudstone and siltstone. marine Lower Winsor Mbr. 180-200 (55-60) Jcwg Fm. A few thin discontinuous sandstones may be present. In North Blue Flats the San Rafael Group Mussentuchit is discontinuous. Forms slopes. 0-30 feet (0-10 m) thick. Carmel Paria River Mbr. 150-200 (45-60) Jcpr eolian J U R A S I C J U R A Page Sandstone 130-150 (40-45) Jpc Kcr Ruby Ranch Member of the Cedar Mountain Formation (Lower Cretaceous) – Variegated purple, brown, and red mudstone with minor limestone and sandstone beds. Drab colors are more pastel than the Brushy Basin Member of the Morrison Formation (below), and may help distinguish the two where Navajo Sandstone 900-1300 (275-395) Jn eolian the Buckhorn is missing, although color is not necessarily diagnostic. CORRELATION OF MAP UNITS Consists of thin-bedded, laminated, slope-forming mudstone and shale with carbonate nodules. Contains a few sandstone beds and lenses of light-gray to

light-brown cross-bedded sandstone to conglomerate. 0-60 feet (0-20 m) e Qal n

thick. e Kayenta Formation 300-400 (90-120) Jk fluvial c Y Glen Canyon Group o l Buckhorn Conglomerate Member of the Cedar Mountain Formation R

Kcb o A Qmt Qe Qae Qal2 Wingate Sandstone 350-400 (105-120) JTRw eolian (Lower Cretaceous) – Gray to brown conglomerate to conglomeratic H Qal N 2

sandstone that is commonly cross-bedded. Pebbles consist of white, gray, R

E Qmtv R brown, and red chert, light-gray quartzite, clear quartz, and light-gray T Owl Rock Member 180-220 (55-65) T co A limestone. Minor beds of light-gray, light-green, or purple mudstone, silty e Qat U n Petrified Forest Member 180-200 (55-60) TRcp lacustrine/ e

sandstone, light-gray limestone, and light-gray conglomeratic limestone. Q

c Qatf Qatd Qatpu fluvial

1 1 Chinle

Unit is missing locally due to non-deposition and/or erosion. Forms ledges o R Formation T cm t Qatf2 Qatdu Monitor Butte Member 150-200 (45-60) s and cliffs. 0-50 feet (0-15 m) thick. i Qatf3 Shinarump Cg. Mbr. 0-20 (0-6) R e T cs

l Eastward view of looking down the Fremont River. Capitol Dome is composed of Jurassic Qatf4 P Qatlo Navajo Sandstone (Jn). It may be viewed at the Hickman Bridge parking area along Highway 24. In this JURASSIC ROCKS Qatf5 Moody Canyon coastal Qatfu 250-300 (75-90) TRmm photo the canyon walls are composed primarily of Jurassic/Triassic Wingate Sandstone with the Jurassic Member plain & Kayenta Formation capping the left cliff face on the skyline. Brushy Basin Member of the Morrison Formation (Upper Jurassic) – Unconformity tidal flat Jmb S I C R I A T Reddish-brown and light-greenish-gray laminated to thin-bedded mudstone, Tertiary Ti Torrey Member 200-220 (60-65) TRmt Moenkopi claystone, and siltstone. The mudstone contains significant quantities of (~ 4 Ma) Formation marine swelling clays and weathers to produce a popcorn-like texture on the surface. Contains local gray to buff sandstone. Forms badlands-type topography. Sinbad Ls. Member 40-70 (12-20) TRms 200-360 feet (60-110) thick. Kmt

Salt Wash Member of the Morrison Formation (Upper Jurassic) – Upper Jms Kd Light-grayish-brown to light-gray, fine- to very coarse grained, cliff-forming sandstone and colored, chert-rich pebble conglomerate. Contains minor Unconformity SOURCES OF DATA amounts of interbedded, very thin, laminated beds of red and grayish-green Billingsley, G.H., Huntoon, P.W., and Breed, W.J., 1987, Geologic map of Capitol Reef National Park mudstone. Forms ledges and slopes. 100-200 feet (30-60 m) thick. Kcm ROADS AND TRAILS and vicinity, Emery, Garfield, Millard, and Wayne Counties, Utah: Utah Geological and Mineral Survey Map 87, scale 1:62,500. Kayenta Formation Jmt Tidwell Member of the Morrison Formation (Upper Jurassic) – Western Escarpment of CRETACEOUS Kcr Predominantly gray, green, and red, crinkly, thin-bedded mudstone. Thin Blakey, R.C., Havholm, K.G., and Jones, L.S., 1996, Stratigraphic analysis of eolian interactions with the Waterpocket Fold Lower beds of gray, dense limestone are interbedded with the mudstone locally. Paved road marine and fluvial deposits, Middle Jurassic Page Sandstone and Carmel Formation, Colorado Wingate Sandstone Small amounts of gypsum may be present. Forms a slope. 15-30 feet (5-10 Kcb Plateau, USA: Journal of Sedimentary Research, v. 66, n. 2, p. 324-342. m) thick. Unconformity Bump, A.P, and Davis, G.H., 2003, Late Cretaceous-Early Tertiary Laramide deformation of the northern Chinle - Owl Rock Gravel and dirt road , Utah and Colorado: Journal of Structural Geology, n. 25, p. 421-440. Js Summerville Formation (Upper Jurassic) – Thin-bedded red-brown mudstone Chinle - Petrified Forest Davis, G.H., 1978, Monocline fold pattern of the Colorado Plateau, in Matthews, V., III, editor, Laramide Chinle - Shinarump and siltstone with thin interbeds of limestone, sandstone, and gypsum. Jmb Chinle - Monitor Butte “Coconut” gypsum stringers may be found as fracture and fault fill. Forms Trail folding associated basement block faulting in Northwestern United States: Geological Society of America, Memoir 151, p. 215-233. cliffs, ledges, and slopes. 130 feet (40 m) thick. Jms Moenkopi - Moody Canyon Key access roads, selected trails, and prominent Delaney, P.T., and Gartner, A.E., 1997, Physical processes of shallow mafic dike emplacement near features in and near Capitol Reef National Park Curtis Formation (Upper Jurassic) – Light-grayish-green, glauconitic, the , Utah: Geological Society of America Bulletin, v. 109, n. 9, p. 1177-1192. Jcs Jmt shown in brown. Condition and status of roads and calcite-cemented sandstone and siltstone with thin interbeds of sandy trails may change over time. Some not shown. Doelling, H.H., and Kuehne, P.A., 2002, Provisional geologic map of the east half of the Loa 30’ x 60’ Moenkopi - Torrey limestone. Forms steep slopes and ledges. 80 feet (25 m) thick. From data provided by National Park Service. Upper J-5 Unconformity quadrangle, Utah: Utah Geological Survey, Open File Report 489, scale 1:62,500. Eisenberg, L., 2003, Giant stromatolites and a supersurface in the Navajo Sandstone, Capitol Reef Je Entrada Sandstone (Middle Jurassic) – Grayish-red to moderate-red mudstone interbedded with moderate-reddish-orange fine-grained sandstone. Js National Park, Utah: Geology, v. 31, no. 2, p. 111-114. Grayish-orange cross-bedded eolian sandstone of varying thickness are Eddleman, J.L., 2005, Elevation, longitudinal profile, and Schmidt Hammer analysis of strath terraces locally present. Upper portion may contain thin beds of nodular gypsum and Jcs through Capitol Reef National Park; Bedrock channel response to climate forcing?: Provo, Utah, “coconut” gypsum fracture-filling veins. The vast majority of the Entrada Brigham Young University, M.S. Thesis, 111 p. J-3 Unconformity Sandstone in this quadrangle is referred to as the "earthy" facies Kirkland, J.I., Britt, B., Burge, D.L., Carpenter, K., Cifelli, R., DeCourten, F., Eaton, J., Hasiotis, S., and Lawton, T., 1997, Lower to middle Cretaceous dinosaur faunas of the central Colorado Plateau - a key (tidal-influenced mudflats) as opposed to the "slick rock" (eolian) facies Je (Morris and others, 2005). Forms a slope. 430-490 feet (130-150 m) thick. to understanding 35 million years of tectonics, sedimentology, evolution, and biogeography: Brigham Young University Geology Studies, v. 42, pt. II, p. 69-103.

JURASSIC Southeastward view of the western escarpment of the Waterpocket Fold. The near cliff exposes Triassic Moen- Jcwb Upper Winsor (Banded) Member of the Carmel Formation (Middle Jurassic) Jcwb Nelson, S.T., and Tingey, D.G., 1997, Time transgressive and extension-related basaltic volcanism in – Pale-reddish-brown siltstone and mudstone with gypsum stringers that are southwest Utah and vicinity: Geological Society of America Bulletin, v. 109, n. 10, p. 1249-1265. kopi Formation at the base, Chinle Formation in middle, Wingate Sandstone as the vertical cliff face, and the Kayneta Formation capping the cliff. Note the distal Henry Mountains in background. interbedded with pale-olive mudstone. Slope-forming unit contains deformed Jcwg Marchetti, D.W., 2000, Cosmogenic 3-helium exposure age dating of Pleistocene deposits in the Capitol beds due to gypsum movement. Locally gypsum diapirs cut unit. 180-200 Middle Reef area, Utah: Salt Lake City, University of Utah, M.S. Thesis, 97 p. feet (55-60 m) thick. Jcpr Martin, D.H., Morris, T.H., and Sorber, S.C., 2007, Geologic map of the Golden Throne quadrangle, Wayne and Garfield Counties, Utah: Utah Geological Survey Miscellaneous Publication 07-01, 2 Jcwg Lower Winsor (Gypsum) Member of the Carmel Formation (Middle Jurassic) – Light-gray to white gypsum, pale-reddish-brown siltstone and Jpc plates, scale 1:24,000. Mitchell, G.C., 1985, The Permian-Triassic stratigraphy of the northwest Paradox basin area, Emery, mudstone beds with gypsum stringers, and light-gray to greenish-gray J-2 Unconformity mudstone. Forms slopes and ledges. Ledges are composed of up to 40-foot Garfield, and Wayne Counties, Utah: The Mountain Geologist, v. 22, n. 4, p. 149-166. (13 m) thick layers of gypsum. Bedding is commonly deformed due to Jn Morris, T.H., McBride, J.H., and Monn, W.D., 2005, A multidisciplinary approach to reservoir charac- movement of gypsum beds. 180-200 feet (55-60 m) thick. teristics of the coastal Entrada erg-margin gas play, Utah: Utah Geological Survey, Open File Report 459, CD. Paria River Member of the Carmel Formation (Middle Jurassic) – Jk Jcpr Lower Morris, T.H., Manning, V.W., and Ritter, S.M., 2000, Geology of Capitol Reef National Park, Utah, in Moderate-reddish-brown mudstone and siltstone, yellowish-gray siltstone, Sprinkel, D.A., Chidsey, T.C., Jr., and Anderson, P.B., editors, Geology of Utah’s parks and JTRw and a bed of light-gray to white gypsum. Forms ledges. Gypsum bed is monuments: Utah Geological Association Publication 28, p. 84-105. locally discontinuous due to gypsum flow. 150-200 feet (45-60 m) thick. Peterson, F., 1988, Stratigraphy and nomenclature of Middle and Upper Jurassic rocks, western Colorado Unconformity Fremont River Drainage Plateau, Utah and Arizona: U.S. Geological Survey Bulletin 1633-B, p.13-56. Jpc Page Sandstone (Middle Jurassic) – The Page Sandstone is composed of two members: the Harris Wash Member (lower) and the Thousand Pockets Repka, J.L., Anderson, R.S., and Finke, R.C., 1997, Cosmogenic dating of fluvial terraces, Fremont TRco Moenkopi - Sinbad Member (upper) (Martin and others, 2007). These are separated by the Judd River, Utah: Earth and Planetary Science Letters 152, p. 59-73. Sorber, S.C., Morris, T.H., and Gillespie, J., 2007, Geologic map of the Twin Rocks quadrangle, Wayne Hollow Tongue, a member of the overlying Carmel Formation that is TRcp included in the Page map unit. The Harris Wash Member is very-pale-orange County, Utah: Utah Geological Survey Miscellaneous Publication 07-03, scale 1:24,000. Boulder-covered strath terraces

to pale-yellowish-orange, fine- to medium-grained, cross-bedded sandstone. Upper TRcm It is 90-110 feet thick (30-34 m). Based on pollen assemblages and ages, the Moenkopi - Torrey upper part of the Judd Hollow Tongue correlates with the Crystal Creek TRcs ACKNOWLEDGMENTS Member of the Carmel Formation as mapped in southwestern Utah, and the Judd Hollow Tongue as mapped in south-central Utah (Douglas A. Sprinkel Unconformity and Hellmut H. Doelling, personal communication, 2005). It is The authors express their appreciation to the Utah Geological Survey for its support and composed of slope-forming, ripple-laminated, moderate-reddish-brown to

TRIASSIC TRmm willingness to publish this map. Specifically, Grant Willis is thanked for his constant support dark-reddish-brown mudstone and sandstone with locally interbedded and helpful reviews, Hellmut Doelling for his willingness to share with us his mapping exper- limestone and is 10-17 feet (3-5 m) thick. The Thousand Pockets Member is TRmt tise and great knowledge of the Colorado Plateau, Darryl Greer and Buck Ehler for very-pale-orange to pale-yellowish-orange, fine- to medium-grained, cartographic and GIS assistance, Buck Ehler for creating the structural contours, and Robert cross-bedded, planar-bedded, and contorted sandstone. It is 17-32 feet thick

Lower Ressetar, Kimm Harty, and Hellmut Doelling for helpful reviews. Thanks are also extended (5-10 m). The Page Sandstone can be distinguished from the underlying TRms to Tom Clark and Dave Worthington of Capitol Reef National Park for their support and Kayenta Formation Navajo Sandstone by the abrupt change in weathering style. The lower logistical help throughout the project, and to Drs. Mathew Mabey and Steve Nelson of portion of the Page Sandstone forms sheer cliffs above the rounded Navajo TRmb Brighan Young University (BYU)for their valuable suggestions, edits, and technical expertise. Sandstone. Total thickness of the Page Sandstone map unit ranges from Financial support for this project has been provided by the U.S. National Park Service (NPS). 130-150 feet (40-45 m) thick. Unconformity Paleozoic Special thanks to Bruce Heise and Tim Connors (NPS) for their support of the project. The Westward view of the Fremont River drainage as seen from the Hickman Bridge area. Flat surfaces represent Rocks stream-cut strath terraces. The distal dark sliver (beneath cloud) is Boulder Mountain - part of the headwa- Jn Navajo Sandstone (Lower Jurassic) – Very-pale-orange to pale-gray, Pu support of the BYU College of Physical and Mathematical Sciences and the Department of large-scale, high-angle, trough cross-bedded, very fine to fine-grained Undifferentiated Geological Sciences is also greatly appreciated. ters of the Fremont River. sandstone. Localized soft-sediment deformation observable in the upper few hundred feet may be associated with cataclysmic failure of interdune lakes DISCLAIMER within the Navajo erg (Eisenberg, 2003). Forms cliffs and rounded domes. The basal map contact in the transitional zone with the underlying Kayenta Research supported by the U.S. National Parks Service, under NPS Grant Formation has been chosen as the last prominent but slope-forming red shale #P2360032216. The views and conclusions contained in this document are those of the bed beneath uniform cross-bedded eolian sandstone. Sandstones beneath this authors and should not be interpreted as necessarily representing the official policies, either red shale bed are both eolian and fluvial in nature and have been placed expressed or implied, of the U.S. Government. within the Kayenta Formation. 900-1300 feet (275-395 m) thick.

A SOUTHWEST Fremont River NORTHEAST A' Scenic Drive Highway 24 Feet Feet 7000 H o r s e M e s a S o u t h D e s e r t 7000 Jcp Qmt Deep Creek Jcpr TRms Qatf4 Qatf2 Jpc TRmt Qmt Jpc N o r t h B l u e F l a t s 6000 Qal Qal Js 6000 Jn Jcwg Jcwb Jcs TRmb Jmt Jms Qal Kcr Jn Qal Kd Qal

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