U.S. DEPARTMENT OF THE INTERIOR MISCELLANEOUS FIELD STUDIES MAP MF–2338 U.S. GEOLOGICAL SURVEY Version 1.0

110°30' 110°00' 111° 110°30' 110° 109°30' 109° CORRELATION OF MAP UNITS DESCRIPTION OF MAP UNITS 45°45' 45°45' SEDIMENTARY AND VOLCANIC ROCKS SEDIMENTARY AND VOLCANIC ROCKS Holocene and Qs Surficial deposits (Holocene and Pleistocene)—Alluvium in stream-channel, flood-plain, and Qs Qt terrace deposits; talus, colluvium, landslide deposits, rock glaciers, and glacial deposits (till, Pleistocene QUATERNARY outwash, and glacial lake deposits) Qy Qb Pleistocene Qt Travertine (Holocene and Pleistocene)—Exposures limited to the Gardiner area in 14 14 INTRUSIVE ROCKS AND BRECCIA PIPES southwesternmost part of study area Unconformity (TERTIARY AND CRETACEOUS) Qy Lava Creek Tuff of Yellowstone Group (Pleistocene)—Rhyolitic ash-flow tuff in Gardiner area in MAPPED AREA southwesternmost part of study area 9 Tlp Qb Basalt (Pleistocene)—Basalt flows in Gardiner area in southwesternmost part of study area

9 6 Tbh Tba Tv Absaroka Volcanic Supergroup (Eocene)—Volcanic and volcaniclastic rocks including basaltic, andesitic, and dacitic flows and flow breccias, rhyolitic ash-flow tuff and vitrophyre, tuff Kll 9 Qs Tdp Tgr Tdi Tmz Thm breccias, lahars, agglomerates, agglutinates, conglomerate, and minor andesitic and dacitic intrusive bodies 14 Tv Eocene Klc Th TKf Fort Union Formation (Paleocene and Upper Cretaceous)—Conglomerate, sandstone, and shale 45°30' 6 6 14 7 TERTIARY Ka in southeast corner of study area 7 12 13 Ka Tfm ABSAROKA-BEARTOOTH Qs Kal Andesite (Upper Cretaceous)—Lava flows in Sliderock Mountain area in northern part of study area 2 Ti Tsb STUDY AREA Kll Lahars of Livingston Group (Upper Cretaceous)—Lahar deposits; mostly clast supported; minor Ka Ta intercalated ash-flow tuff, lava flows, flow breccias, and epiclastic conglomerate, sandstone, 7 siltstone, and mudstone 9 Paleocene Klc Sedimentary rocks of Livingston Group (Upper Cretaceous)—Epiclastic conglomerate, Ka TKf TKi sandstone, siltstone, and mudstone Ka Kad Andesite (Upper Cretaceous)—Lava flows and flow breccias at or near base of Livingston Group Kll Ki Kgl 12 12 13 13 Kus Ka Kd Ku Sedimentary rocks (Upper and Lower Cretaceous), undivided—Sandstone, shale, limestone, and Kus Ka 2 Unconformity Upper conglomerate. Used in Sliderock Mountain area and along a fault in center of study area, Jၣs Cretaceous 2 1 Kls Kal CRETACEOUS where the stratigraphic assignment of these Cretaceous sedimentary rocks could not be Kls determined with certainty Ka Kal Kll Klc Kad Kus Sedimentary rocks (Upper Cretaceous)—Includes Eagle Sandstone, Telegraph Creek 9 3 Ka Kll Qs Kus Ka Kus Formation, Cody Shale, Frontier Formation, and Montana Group. Sandstone and shale Ku Kls Sedimentary rocks (Lower Cretaceous)—Includes Mowry Shale, Thermopolis Shale, Kootenai 8 ၣ Lower 10 3 1 11 J s Kls Ka Ka Cretaceous Formation, and Cloverly Formation. Sandstone, shale, limestone, and conglomerate Kll Jၣs Sedimentary rocks (Jurassic and Triassic)—Includes Morrison Formation, Ellis Group, and Kls Kad 4 5 Kus Chugwater Formation. Sandstone, shale, and limestone 11 Ku Unconformity 8 9 PMs Kal ၦ Undifferentiated sedimentary rocks (Paleozoic) 45° 10 ၤs PMs Klc Kal DOs JURASSIC PMs Sedimentary rocks (Permian, Pennsylvanian, and Mississippian)—Includes Phosphoria, PMs Kal Jၣs Klc TKi Kd Quadrant, and Amsden Formations and Madison Group. Limestone, shale, sandstone, and Kus Klc TRIASSIC DOs dolomite INDEX TO SOURCES OF GEOLOGIC DATA Aqa Kus PMs PMs Kls DOs Sedimentary rocks (Devonian and Ordovician)—Includes Three Forks Shale, Jefferson Jၣs Qs Ka Unconformity SOURCES OF GEOLOGIC DATA Aga Formation, and Bighorn Dolomite. Shale, limestone, and dolomite Kus Kls Oၤs Sedimentary rocks (Ordovician and Cambrian)—Includes Bighorn Dolomite, Grove Creek Kus Qs Kus TKi Kll Ka TKi PERMIAN Formation, Snowy Range Formation, Pilgrim Limestone, Park Shale, Meagher Limestone, Kls Kad PATTERNED AREAS: Kls PMs Kls Ka Wolsey Shale, and Flathead Sandstone. Dolomite, limestone, sandstone, siltstone, and shale. DOs PMs Anc Ka PENNSYLVANIAN Limited to the Cooke City area in south-central part of study area 1. Simons, F.S., and Armbrustmacher, T.J., U.S. Geological Survey, Van Noy, R.M., Zilka, N.T., Federspiel, F.E., and Ridenour, James, U.S. Bureau of ၤ PMs PMs Jၣs s ၤs Sedimentary rocks (Cambrian)—Includes Grove Creek Formation, Snowy Range Formation, Mines, 1979, Mineral resources of the Beartooth Primitive Area and vicinity, Carbon, Park, Stillwater, and Sweet Grass Counties, Montana, and Park Anc PMs Kls Kls Kus Kd MISSISSIPPIAN Jၣs TKi ၦ Pilgrim Limestone, Park Shale, Meagher Limestone, Wolsey Shale, and Flathead Sandstone. County, Wyoming, with a section on Interpretation of aeromagnetic data by L.A. Anderson, U.S. Geological Survey: U.S. Geological Survey Qs Qs Kad ၣ Kll Limestone, sandstone, siltstone, and shale Bulletin 1391–F, 125 p., 2 plates, scale 1:125,000. Anc Jၣs J s DEVONIAN DOs 2. U.S. Geological Survey and U.S. Bureau of Mines, 1983, Mineral resources of the North Absaroka Wilderness Study Area, Park and Sweet Grass Kls Kal Qs INTRUSIVE ROCKS AND BRECCIA PIPES (TERTIARY AND CRETACEOUS) Aga ၠAm DOs ORDOVICIAN DOs Counties, Montana: U.S. Geological Survey Bulletin 1505, 251 p., 5 plates, scale 1:62,500. PMs Oၤs TKi Intermediate and felsic intrusive rocks (Tertiary or Late Cretaceous)—Laccoliths, plugs, dikes, Aga 3. Wedow, Helmuth, Jr., and Gaskill, D.L., U.S. Geological Survey, Banister, D.P., and Pattee, E.C., U.S. Bureau of Mines, 1975, Mineral resources of Anc Jၣs Kll Ka Kal ၤs CAMBRIAN sills, and irregular-shaped bodies of fine-grained and porphyritic rhyolite, dacite, quartz latite, the Absaroka Primitive Area and vicinity, Park and Sweet Grass Counties, Montana, with a section on Interpretation of geophysical data by D.L. Aqa As ၤs Kus andesite, and diorite Jၣs Kls Intermediate and felsic rocks (Eocene)—Dikes, sills, and irregular-shaped bodies. Andesite, quartz Peterson, U.S. Geological Survey: U.S. Geological Survey Bulletin 1391–B, 115 p., 2 plates, scale 1:62,500. PMs Kad Ti ၠ Agn Unconformity Am DOs Kls TKi latite, dacite, and rhyolite; commonly porphyritic ၤs TKi Kal Ka INTRUSIVE ROCKS (PROTEROZOIC AND ARCHEAN) SOLID OUTLINES: Kad Tdp Dacite porphyry (Eocene)—Stock, laccoliths, sills, dikes (not shown on map), plugs, and irregular- As DOs ၤ Aga Jၣs PMs Jၣs s shaped bodies. Includes some andesitic and rhyolitic rocks 4. Casella, C.J., Levay, Joseph, Eble, Edward, Hirst, Brian, Huffman, Kenneth, Lahti, Victor, and Metzger, Robert, 1982, Precambrian geology of the Anc TKi PROTEROZOIC ၤs Kls Tgr Granodiorite porphyry of Emigrant Peak area (Eocene)—Stock near head of Emigrant Creek on southwestern Beartooth Mountains, Yellowstone National Park, Montana and Wyoming, in Mueller, P.A., and Wooden, J.L., eds., Precambrian As ၠ Qs As Agn Am PMs TKi south flank of Emigrant Peak in western part of study area geology of the Beartooth Mountains, Montana and Wyoming: Montana Bureau of Mines and Geology Special Publication 84, p. 1–24, 1 sheet, As PMs Kal Kad ၠAm Asw6 Qs Tdi Diorite porphyry and basaltic andesite (Eocene)—Small stock (or plug) at head of Mill Creek in scale 1:61,815. ၦ ၤ Jၣs Aqa ၠAm DOs Asw5 s Ahd western part of study area, and plugs northwest of Cooke City 5. Casella, C.J., 1969, A review of the Precambrian geology of the eastern Beartooth Mountains, Montana and Wyoming, in Larsen, L.H., Prinz, ° Asw7 PMs 45 30' Asw4 45°30' Tmz Monzodiorite of Independence district area (Eocene)—Stock, at Monument Peak in central part Martin, and Manson, Vincent, eds., Igneous and metamorphic geology: Geological Society of America Memoir 115, p. 53–71, 1 sheet, scale Qs Aga Asw3 Qs TKi Agr of study area, composed of multiple phases of andesitic intrusive breccia, monzodiorite, quartz As DOs TKi 1:32,250. Aga ၠ monzodiorite, and quartz monzonite; cut by minor granite dikes Am Kus TKi Kal 6. Roberts, A.E., 1964, Geology of the Brisbin quadrangle, Montana: U.S. Geological Survey Geologic Quadrangle Map GQ–256, scale 1:24,000. ၠAm Asw6 Asw7 Asw6 Asw5 Asw4 Asw3 Asw2 Asw1 ARCHEAN Tlp Dacite porphyry of Lulu Pass (Eocene)—Laccolith and dikes (not shown on map) about 3 mi (5 Asw1 TKi ၤ Kll 7. Segerstom, Kenneth, and Carlson, R.R., 1982, Geologic map of the banded upper zone of the Stillwater Complex and adjacent rocks, Stillwater, As ၠAm Jၣs s km) north-northwest of Cooke City Asw2 Asw5 Agn Sweet Grass, and Park Counties, Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I–1383, scale 1:24,000, 2 sheets. DOs Tbh Breccia of Homestake mine area (Eocene)—Explosion-collapse breccia pipe, about 2.2 mi (3.5 Anc Asw3 PMs An km) north of Cooke City, composed of blocks of Cambrian sedimentary rocks, porphyritic As Agn ၤs DASHED OUTLINES: Ash PMs TKi DOs intrusive rocks, volcanic rocks, and Precambrian gneissic rocks in chloritic matrix; altered and TKi Kus METASEDIMENTARY AND METAIGNEOUS ROCKS (ARCHEAN) mineralized; intruded by later dikes of rhyolite and quartz latite porphyry 8. Elliott, J.E., 1979, Geologic map of the southwest part of the Cooke City quadrangle, Montana and Wyoming: U.S. Geological Survey Miscellaneous Anc Aga ၣ Kls Aum Asw4 J s Tba Investigations Series Map I–1084, scale 1:24,000. ၠAm Breccia of Alice E mine area (Eocene)—Collapse(?) breccia, about 1 mi (1.6 km) north of Cooke TKi As Aga Anc Aqa Ash Am 9. Foose, R.M., Wise, D.U., and Garbarini, G.S., 1961, Structural geology of the Beartooth Mountains, Montana and Wyoming: Geological Society of As Asw7 Qs UNDIVIDED INTERMEDIATE AND MAFIC INTRUSIVE ROCKS Aag City, composed of blocks of Cambrian sedimentary rocks in a pulverized rock-flour matrix; EOCENE OR locally altered and mineralized; intruded by later dikes of quartz latite porphyry America Bulletin, v. 72, no. 8, p. 1143–1172, 1 sheet, scale 1:126,720. d PRECAMBRIAN ၠAm ၠ Kls Thm Dacite porphyry of Henderson Mountain (Eocene)—Stock and dike (not shown on map) about 1 10. Fraser, G.D., Waldrop, H.A., and Hyden, H.J., 1969, Geology of the Gardiner area, Park County, Montana: U.S. Geological Survey Bulletin 1277, Am TKi As Jၣs (age uncertain) mi (1.6 km) north of Cooke City Asw1 Asw2 118 p., 1 plate, scale 1:24,000. Aga Kus Th Dacite porphyry of Homestake mine area (Eocene)—Stock, sills, dikes (not shown on map), and Aga Kus Qs 11. James, H.L., 1946, Chromite deposits near Red Lodge, Carbon County, Montana: U.S. Geological Survey Bulletin 945–F, p. 151–189, plates As Qs Asw3 Kls Asw5 Asw6 ၤs DOs irregular-shaped bodies, about 2 mi (3.2 km) north of Cooke City; contains abundant rounded, 52–64, scale 1:24,000. ၠAm commonly embayed quartz phenocrysts; commonly altered and locally mineralized 12. Page, N.J., Simons, F.S., and Dohrenwend, J.C., 1973, Reconnaissance geologic map of the Mount Douglas quadrangle, Montana: U.S. Geological Kll Tfm Complex of Fisher Mountain area (Eocene)—Stock(?) composed of aphanitic and fine-grained As Qs Asw4 Survey Miscellaneous Field Studies Map MF–488, scale 1:62,500. Qs Qs porphyritic dacite, rhyolite, and quartz latite and felsite breccia, about 2.8 mi (4.5 km) north of Ash PMs Cooke City; intruded by quartz-rich dacite and porphyritic and aphanitic dikes (not shown on 13. Page, N.J., Simons, F.S., and Dohrenwend, J.C., 1973, Reconnaissance geologic map of the Mount Wood quadrangle, Montana: U.S. Geological Agn Kls Survey Miscellaneous Field Studies Map MF–491, scale 1:62,500. Agn Asw2 Asw5 map); strongly feldspathized, silicified, sericitized and (or) argillitized, and pyritized ၠ 14. Richards, P.W., 1957, Geology of the area east and southeast of Livingston, Park County, Montana: U.S. Geological Survey Bulletin 1021–L, p. Am Tsb Diorite of Scotch Bonnet Mountain (Eocene)—Stock and irregular-shaped intrusive bodies about ၣ 3.3 mi (5.3 km) north of Cooke City 385–438, plates 34–36, scale 1:24,000. J s Kus ၠAm Ta Andesite and trachyandesite porphyry (Eocene)—Sills in Cooke City area ၤ Asw4 PMs ၠAm s DOs ° Kus Ka Andesite (Late Cretaceous)—Dikes in Sliderock Mountain area in northern part of study area 111 00' Asw1 Asw3 Asw5 Kls 109°30' 109°00' As Ash ၤs ၠAm Asw3 ၤs Asw4 Kd Diorite of Sliderock Mountain (Late Cretaceous)—Stock; variable grain size and textures may Asw3 Qs indicate multiple phases; locally altered Asw2 Asw2 Asw1 Ki Rhyolite and quartz latite porphyry (Late Cretaceous)—Sills, dikes (not shown on map), and ၠ ၠAm Am Kls irregular-shaped bodies in Goose Lake area, about 6.5 mi (10.5 km) north- northeast of Cooke ၠAm ၠAm Agn Agr As Ash Asw2 ၣ City ၠAm Agr ၤs J s Qs Ash Kgl Syenite of Goose Lake (Late Cretaceous)—Stock, about 7 mi (11.3 km) north- northeast of As Qs Agr ၤs Cooke City, composed of multiple phases of syenite and monzonite of variable grain sizes and As Aag ၠAm ၠ As Aag DOs textures; locally altered and mineralized Am Agn Ash Asw1 Ash As As Ku Aag ၤs ၠ ၠAm INTRUSIVE ROCKS (PROTEROZOIC AND ARCHEAN) Aga Qs Am As ၠAm ၠ Mafic intrusive rocks (Proterozoic and Archean)—Includes sills, dikes, stock, and irregular-shaped Jၣs Am Ahd bodies of alkali olivine dolerite, metadolerite, metanorite, metagabbro, and quartz dolerite, and Qs ၠ Qs DOs Tdp Am DOs Aag dikes of uncertain or unknown affinities DOs ၠAm Aag ၦ As Agr Ahd Hornblende quartz diorite (Archean)—Small bodies associated with quartz monzonite (Agr) south PMs Ti Asw1 of eastern exposures of the Stillwater Complex (Asw units) Agn ၤs Tdp Agn Granitic intrusive rocks (Archean)—Includes stocks and irregular-shaped bodies of fine-, medium-, DOs Agn As Agr and coarse-grained quartz monzonite and aplite south of eastern exposures of the Stillwater DOs ၣ Qs Qs As As PMs J s Aag Aag Complex (Asw units). Also includes stocks and bodies of granite in the Gardiner area in ၤs ၠ ၠ ၠAm ၠAm Tdp ၤs Am Am southwesternmost part of study area ၤ PMs Aag s Qs PMs Agn ၠAm Stillwater Complex (Archean)—Stratiform mafic to ultramafic rocks. Divided into seven units as Tv DOs DOs follows Tv ၤs Tdp ၠAm ၠAm Asw7 Upper anorthosite, upper gabbro, and upper mixed zones As Tdp As As As ၤs ၠAm ၠ Qs Asw6 Middle anorthosite zone Tdp Am Agn As ၤs Aag ၠAm DOs ၠAm Ti ၠAm Ti Agn Asw5 Middle mixed, middle gabbro, and lower mixed zones DOs ၠ Agn Ti Ti ၠ ၤs Ti DOs Am Aag Am Ti Asw4 Lower anorthosite zone Ti As ၠAm Tv ၤs PMs Qs ၠAm Asw3 Lower gabbro and norite zones Tdp Tdi Tv Tdp Ti ၠAm TKi TKi Asw2 Bronzitite zone Agn Aag ၠ As Aag Am Qs TKi Aag ၠAm Jၣs Asw1 Peridotite zone Tdp Qs Aag ၤs Qs ၤs ၠ Tgr Ti Am Kls Agn Granitic gneiss (Archean)—Predominantly granitic gneiss and migmatite; commonly consists of As Tdp Ti Qs ° Tdp TKi As ° 45 15' Tgr Ti Tdp TKi Kus 45 15' alternating bands of more felsic and more mafic gneiss; contains inclusions of metasedimentary Tv Agn Ti Tv d Ti TKi Ti Ti DOs ၠAm and metaigneous rocks Qs Tv ၤ Agn DOs An Metanorite and metagabbro (Archean)—Stock-like mass composed of metanorite and metagabbro s Aag Qs As ၠAm cropping out in southeastern part of study area As Ultramafic rocks (Archean)—Irregular-shaped bodies and lenses of olivine-bearing rocks and Ti TKi Aum Ti ၠ ၤs serpentinite cropping out in southeastern part of study area Agn Am TKi Tdp d Qs Qs ၠAm PMs Tv Tv METASEDIMENTARY AND METAIGNEOUS ROCKS (ARCHEAN) Tv TKi Qs Kls Qs Ti TKi ၠAm Agn Agn ၠ ၣ As Biotite schist (Archean)—Includes minor quartzite, iron-formation, and amphibolite Tdp Ti Am J s Jၣs Tdp Ti Aag PMs As Ti As TKi ၠAm DOs Amphibolite and hornblende gneiss (Archean)—Mostly tabular and lensoid bodies enclosed in Tdp d ၤ ၤ Aag s Tmz TKi TKi s granitic gneiss and migmatite Agn Tdp Kls Aga Amphibolite and gneiss (Archean)—Includes trondhjemitic gneiss-amphibolite, paragneiss, and Tv Agn Aag DOs PMs Qs ၠAm TKi ၠ TKf heterogeneous gneiss sequences, as well as trondhjemitic gneiss, tonalitic gneiss, and Ti Ti d ၠAm ၠ Aag Am Tv Am amphibolite; minor schist, quartzite, and iron-formation Ti Ti Agn ၤ TKi s Anc Nappe complex (Archean)—Sheet-like, allochthonous package of rock units in northwestern part Ti Qs Qs d ၠAm Agn of study area. Includes Barney Creek Amphibolite, George Lake Marble, and Jewel Quartzite. Aag Amphibolite, dolomitic marble, marble, and quartzite; minor schist and iron-formation Agn Qs Tv Ti Qs Ti Aag Aqa Quartzite and amphibolite (Archean)—Interlayered quartzite and orthoamphibolite; minor schist Ti d ၠAm Tdp TKi Ash Schist and hornfels (Archean)—Metasedimentary rocks consisting predominantly of schist and Ti d TKi ၠAm Qs TKf hornfels with minor quartzite, amphibolite, and iron-formation; contact metamorphosed to Ash Aag Tv TKi ၠ hornblende-hornfels and pyroxene-hornfels facies at and near base of Stillwater Complex. Ti Qs Am Tv Ti Qs Host for Homestake-type gold deposits near Jardine in southwestern part of study area Agn Tdp ၠAm Ash Tv Tv Tv TKi Aag ၠAm Am Undifferentiated metamorphic rocks (Archean)—Includes amphibolite, micaceous quartzite, and Ti Ti d DOs some gneiss. Also includes some small bodies of chromite-bearing serpentinite. Limited to Ti TKi Aag TKi ၠAm Qs d d ၠ TKi southeastern part of study area ၠAm Ti TKi Am Qs d d ၠAm ၠ TKi TiDOs Ti Am TKi Aag TKi UNDIVIDED INTERMEDIATE AND MAFIC INTRUSIVE ROCKS ၠAm ၤ Tv Qs Qs s ၤ d DOs PMs Dikes and sills of andesite and basalt (Eocene or Precambrian, age uncertain) Ti s Agn TKi d Tv Tdp Tdp ၤs ၠAm Tv Tv Agn Ash TKi TKi ၤs d d ၠAm Ki ၠAm Contact Tv Ash Ti Tv ၠAm Aag TKi ၠAm ၦ Ti DOs Kgl Qs Qs Tv Qs Ki Qs ၠAm Fault—Dashed where approximately located or inferred; dotted where concealed. Bar and ball on Ti ၤs TKi TKi TKi Ti ၤs downthrown side Ti ၠAm Agn ၠAm ၠAm DOs Kgl Ki ၠAm TKi Thrust fault—Dashed where approximately located or inferred; dotted where concealed. Sawteeth ၠAm Agn Am Agn ၠAm Agn ၤ on upper plate d Agn s Tdp d Aag TKi Am TKi Qs Mylonitic shear zone TKi Tv ၠ ၠAm Ash Am TKi ၠAm Ash ၠAm Trace of surface of tectonic denudation of Heart Mountain detachment—This surface occurs Agn Ti Ti TKi TKi Tv Ti Agn TKf near Cooke City within the map area Agr ၠAm Ash ၤs Ti Tv DOs Am Ti Qs Trace of axial plane of major anticline Tv Ta Jၣs ၤs ၤs Am Trace of axial plane of major syncline Tv Ash ၤs Ti ၤs ၠAm ၠAm Tv Tlp Ti Aag ၤ Qs Tv Ta ၠAm s Tv Tsb PMs Qb Ti Tv DOs DOs TKi Kus Ti Am Aag Tv Qy Ash Ash PMs Ti Tfm ၠ TKi Qs ၤs Ti Ta Am Qb Qs d Tv Qs DOs ၤs ၤs ၤs Th Tbh Oၤs Tlp ၤ TKi Qs Qs ၠAm Ti PMs s Agn ၠAm Tv ၠAm TKi Aag DOs Tv Th TKi Qt ၤs Ta Qb Qy Tv ၤs Agn TKi ၦ Agn Ti Thm Aag Am Qb Tv ၠAm Ti Am Agr ၤs ၦ Tv Aum Qb Ash Qs ၤs Ta Ta Am Agn Tv DOs DOs Aum ၤs Qs Qb ၠ ၤs Ti ၤ Aag Aum Qs Aum Agn ၠAm Am ၤs Aag Aag s Aum Agr Oၤs Tba Ash Agr Ash ၤs PMs Aum Agn ၤs ၤ TKi ၦ O s Qs TKi Kus Qt An TKi MONTANA Tv Tv Ti Aag ၠAm Agn Kls DOs ၠ Aum ၠAm PMs Tsb Am TKi TKf ၠAm TKi ၤs Am ၤs Ta Qs Jၣs Qs ၠAm Oၤs 45°00' Aag Am Aag 45°00' Qs Tv ၦ Tv ၤ Yellowstone 111°00' WYOMING ၦ PARK COUNTY s DOs 109°00' 110°30' WYOMING WYOMING 110°00' ၤs PARK COUNTY ၤs WYOMING 109°30' National Park Base from U.S. Geological Survey, 1:250,000 Geology compiled by B.S. Van Gosen, J.E. Elliott, Billings, 1954, revised 1979; Bozeman, 1958, revised 1972 SCALE 1:126 720 R.R. Carlson, and M.L. Zientek, 1992 New mapping by J.E. Elliott, E.A. du Bray, Projection: Universal Transverse Mercator, zone 12 2 1 04682 10 MILES 1927 North American Datum B.S. Van Gosen, and E.J. LaRock, 1991 INDEX TO MAPPED AREA Manuscript approved for publication March 14, 2000 2 1 0 2 4 6 8 10 12 14 KILOMETERS

CONTOUR INTERVAL 200 FEET SUPPLEMENTARY CONTOUR INTERVAL 100 FEET IN BILLINGS QUADRANGLE NATIONAL GEODETIC VERTICAL DATUM OF 1929 Any use of trade names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey

This map was produced on request, directly from GENERALIZED GEOLOGIC MAP OF THE ABSAROKA-BEARTOOTH STUDY AREA, SOUTH-CENTRAL MONTANA digital files, on an electronic plotter For sale by U.S. Geological Survey Information Services Compiled by Box 25286, Federal Center, Denver, CO 80225 B.S. Van Gosen, J.E. Elliott, E.J. LaRock, E.A. du Bray, R.R. Carlson, and M.L. Zientek 1-888-ASK-USGS This map is also available as a PDF at http://greenwood.cr.usgs.gov Digital database by Jeffery T. Silkwood; edited by Gregory N. Green and B.S. Van Gosen ARC/INFO coverages are available at 2000 http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-99-0450/