Stratigraphic Cross Sections of the Eocene Green River Formation In

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Stratigraphic Cross Sections of the Eocene Green River Formation in the Click here to return to Green River Basin, Southwestern Volume Title Page Wyoming, Northwestern Colorado, and Northeastern Utah

By Jesse G. Self, Robert T. Ryder, Ronald C. Johnson, Michael E. Brownfield, and Tracey J. Mercier

Chapter 5 of 6 Oil Shale Resources of the Eocene Green River Formation, Greater Green River Basin, Wyoming, Colorado, and Utah

By U.S. Geological Survey Oil Shale Assessment Team

U.S. Geological Survey Digital Data Series DDS–69–DD

U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2011

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Suggested citation: Self, J.G., Ryder, R.T., Johnson, R.C., Brownfield, M.E., and Mercier, T.J., 2011, Stratigraphic cross sections of the Eocene Green River Formation in the Green River Basin, southwestern Wyoming, northwestern Colorado, and northeastern Utah, in U.S. Geological Survey Oil Shale Assessment Team, ed., Oil shale resources of the Eocene Green River Formation, Greater Green River Basin, Wyoming, Colorado, and Utah: U.S. Geological Survey Digital Data Series DDS–69–DD, chap. 5, 7 p., 24 plates. iii

Contents

Introduction...... 1 Stratigraphy of the Green River Formation, Wyoming...... 1 Cross Sections...... 5 References Cited...... 6

Plates

1. Cross section A–A’ showing south to north correlation of the Green River and Wasatch Formations, western Green River Basin, southwestern Wyoming...... link 2. Cross section B–B’ showing south to north correlation of the Green River and Wasatch Formations, central Green River Basin, southwestern Wyoming...... link 3. Cross section C–C ’ showing south to north correlation of the Green River and Wasatch Formations, eastern Green River Basin, southwestern Wyoming...... link 4. Cross section D–D’ showing south to north correlation of the Green River and Wasatch Formations, eastern Green River Basin, southwestern Wyoming...... link 5. Cross section E–E ’ showing west to east correlation of the Green River and Wasatch Formations, southern Green River Basin, southwestern Wyoming...... link 6. Cross section F–F ’ showing west to east correlation the Green River and Wasatch Formations, southern Green River Basin, southwestern Wyoming...... link 7. Cross section G–G ’ showing west to east correlation of the Green River and Wasatch Formations, central Green River Basin, southwestern Wyoming...... link 8. Cross section H–H ’ showing west to east correlation of the Green River and Wasatch Formations, north-central Green River Basin, southwestern Wyoming...... link 9. Cross section I–I ’ showing west to east correlation of the Green River and Wasatch Formations, northern Green River Basin, southwestern Wyoming...... link 10. Cross section J–J ’ showing west to east correlation of the Green River and Wasatch Formations, northern Green River Basin, southwestern Wyoming...... link 11. Cross section K–K ’ showing south to north correlation of the Green River and Wasatch Formations, western Washakie Basin, southwestern Wyoming...... link 12. Cross section L–L ’ showing south to north correlation of the Green River and Wasatch Formations, western Washakie Basin, southwestern Wyoming...... link 13. Cross section M–M ’ showing south to north correlation of the Green River and Wasatch Formations, central Washakie Basin, southwestern Wyoming...... link 14. Cross section N–N ’ showing south to north correlation of the Green River and Wasatch Formations, eastern Washakie Basin, southwestern Wyoming...... link 15. Cross section O–O ’ showing west to east correlation of the Green River and Wasatch Formations, southern Washakie Basin, southwestern Wyoming...... link 16. Cross section P–P ’ showing west to east correlation of the Green River and Wasatch Formations, from southeastern Green River Basin to southeastern Washakie Basin, southwestern Wyoming...... link 17. Cross section Q–Q ’ showing west to east correlation of the Green River and Wasatch Formations, northern Washakie Basin, southwestern Wyoming...... link iv

18. Cross section R–R ’ showing correlation of the Green River and Wasatch Formations, north to south across central Green River Basin and east to west in Washakie Basin, southwestern Wyoming (after Roehler, 1991b)...... link 19. Cross section S–S ’ showing west to east correlation of the Green River and Wasatch Formations, across central Green River Basin to western Washakie Basin, southwestern Wyoming (after Roehler, 1991b)...... link 20. Cross section T–T ’ showing west to east correlation of the Green River and Wasatch Formations, central Green River Basin, southwestern Wyoming (after Roehler, 1990)...... link 21. Cross section U–U ’ showing west to east correlation of the Green River and Wasatch Formations, southern Green River Basin, southwestern Wyoming (after Roehler, 1991d)...... link 22. Cross section V–V ’ showing west to east correlation of the Green River and Wasatch Formations, Washakie Basin, southwestern Wyoming (after Roehler, 1991c)...... link 23. Cross section W–W ’ showing north to south correlation of the Green River and Wasatch Formations, western Green River Basin, southwestern Wyoming (after Roehler, 1992a)...... link 24. Map showing locations of stratigraphic cross sections in the Greater Green River Basin, southwestern Wyoming...... link

Figures

1. Structure map of the Greater Green River Basin, southwestern Wyoming and adjacent areas, showing major basinal areas and adjoining uplifts...... 2 2. Map showing distribution of oil shale-bearing rocks in the Eocene Green River Formation in southwestern Wyoming, northwestern Colorado, and northeastern Utah...... 3 3. Diagram showing stratigraphic relations of Eocene rocks within the Greater Green River Basin, southwestern Wyoming...... 4

Table

1. Names and definitions for the column headers for the spatial-data spreadsheet (Spatial_Information.xlsx) ...... 5 Stratigraphic Cross Sections of the Eocene Green River Formation in the Green River Basin, Southwestern Wyoming, Northwestern Colorado, and Northeastern Utah

By Jesse G. Self, Robert T. Ryder, Ronald C. Johnson, Michael E. Brownfield, and Tracy J. Mercier

Introduction Stratigraphy of the Green River Formation, Wyoming For several decades, the U.S. Geological Survey (USGS) has collected cores, drill cuttings, and other subsurface data from boreholes drilled to evaluate the oil shale deposits in the The Green River Formation consists of lacustrine and Eocene Green River Formation, as well as from oil and gas fluvial-lacustrine rocks that were deposited in and adjacent to tests, in the Greater Green River Basin of southwestern Wyo- the Eocene Lake Gosiute that covered much of southwestern ming, northwestern Colorado, and northeastern Utah (fig. 1). Wyoming, northwestern Colorado, and northeastern Utah The Greater Green River Basin (GGRB) is the name given to from roughly 52.5 to 47.5 Ma (Smith and others, 2008). The a group of five sub-basins. The names of these sub-basins and lake formed in a structural and sedimentary basin that formed their locations within the Greater Green River Basin are as during the Laramide orogeny, a major mountain-building epi- follows: (1) the Hoback Basin in northwestern portion of the sode in the western United States, which extended from Late GGRB; (2) the Green River Basin in the western portion of the Cretaceous through Eocene time. Lake Gosiute underwent two GGRB; (3) the Great Divide Basin in the north eastern por- major expansions represented by the Tipton Shale Member tion of the GGRB; (4) the Washakie Basin in the east-central and the LaClede Bed of the Laney Member of the Green River portion of the GGRB; and (5) the Sand Wash Basin in the Formation (fig. 3). These units contain the richest and most southeastern portion of the GGRB (figs. 1 and 2). The Greater persistent oil shale zones in the Greater Green River Basin. Green River Basin is one of three basins in the western United The oldest rocks of the Green River Formation in the States that contains oil shale of the Green River Formation. Greater Green River Basin are known as the Tipton Shale The other two are the Piceance Basin in western Colorado and Member. This member is divided into the freshwater Scheggs the Uinta Basin in eastern Utah and western Colorado (fig. 2). Bed and the overlying saline Rife Bed (Roehler, 1991a). A It was from these areas that data were collected and preserved northward-thickening wedge of marginal lacustrine deposits for use by researchers and private industry in anticipation of known as the Farson Sandstone Member of the Green River the time when Green River oil shale deposits would become Formation (fig. 3) (Roehler, 1992b) separates the Scheggs an economically viable alternate source of fossil fuel. In south- and Rife Beds in the Green River Basin portion (western) of western Wyoming, the Green River Formation was deposited the Greater Green River Basin (figs. 1, 2). In the northeastern in Lake Gosiute during early to middle Eocene time, with the portion of the Greater Green River Basin, the Farson Sand- majority of oil shale deposits accumulating in what is defined stone Member is overlain by the Alkali Creek Tongue of the as the Tipton Shale Member, the Wilkins Peak Member, and Wasatch Formation (Roehler, 1991a). These units are not the LaClede Bed of the Laney Member (fig. 3). distinguishable in the subsurface, therefore they are labeled The types of data collected within the Greater Green together in the cross sections that were constructed covering River Basin include: (1) Fischer (shale oil) assays (American the northeastern portion of the Greater Green River Basin. Society for Testing and Materials, 1980) on cores from wells After the deposition of the Tipton Shale Member of the drilled to assess oil shale and drill cuttings from oil and gas Green River Formation, Lake Gosiute regressed to cover a tests, (2) geophysical and lithologic logs of drill holes, and (3) much smaller area of the Greater Green River Basin, as well measured sections from outcrops. Twenty-three subsurface as becoming much shallower. It was during this regressive stratigraphic cross sections were constructed using these vari- period of the lake’s history that the Wilkins Peak Member of ous types of data for basinwide correlations and as a basis for the Green River Formation was deposited (fig. 3) (Bradley, the in-place assessment of the oil shale resources in the basin 1959). Although the Wilkins Peak Member contains significant carried out by the USGS. These cross sections are presented oil shale, it is present in a much more restricted area than the on plates 1–23 in this report. underlying Tipton Shale Member and the overlying LaClede 2 Stratigraphic Cross Sections of the Eocene Green River Formation

INDEX MAP 111° 110° 109° 108° 107°

TETON

Wind 43° FREMONT NATRONA

-4000

-2000

0 Pinedale River Hoback WYOMING 2000 Basin anticline

4000 SUBLETTE Mountains Granite Mountains -8000

La Barge -6000 LINCOLN platform -4000 6000

-2000

-8000 Sandy 0 -6000 2000 Great Divide 42° -4000 Bend Basin arch Rawlins -2000 Moxa 0 uplift CARBON 0 2000

Sweetwater 4000 6000

Wamsutter arch uplift

Basin arch

UINTA Wyoming thrust belt Springs -4000

-2000 -6000

River Rock Washakie SIERRA -8000 -2000 2000 Basin -4000 0 4000

Green 4000 41° 2000 Cherokee ridge

MADRE 0 -2000 DAGGETT SUMMIT Uinta Mountains Sand Wash 0 Routt

Basin -2000

UINTAH 2000 DUCHESNE -6000 -4000 JACKSON 4000 UTAH Axial 6000

MOFFAT Basin

PARK COLORADO uplift GRAND

40° RANGE RIO BLANCO

0 10 20 30 40 MILES 0 10 20 30 40 KILOMETERS GARFIELD EAGLE

EXPLANATION

Outcrop of Mesaverde Group Southwestern Wyoming Province Cross section location Faults Anticlinal axis Enlarged -2000 Contours on top of Mesaverde Group (in feet) area County line

Figure 1. Structure map of the Greater Green River Basin, southwestern Wyoming and adjacent areas, showing major basinal areas and adjoining uplifts. Modified after Johnson and others (2005). Stratigraphy of the Green River Formation, Wyoming 3

112° 111° 110° 109° 108° 107° 106°

187 189 Hoback WYOMING 43° Basin 287 IDAHO Greater Green River Basin (Southwestern Wyoming Province Boundary) 28 Great Divide Basin 287 Green 42° 187 Rawlins River Green River Rock Springs 189 80 Basin 80 789 Evanston Green River 430 80 Washakie Great Salt Lake 414 Basin 80 Baggs 41° Salt Lake City Sand Wash 13 44 318 Basin 40 318 COLORADO Utah Vernal 40 Yampa River Yampa Lake River Craig 40 Rangely White 40 Provo 13 40 White 64 River 40° 50 33 River River Uinta Basin Piceance Meeker Basin Colorado Price 13 70 50 139 Rifle Uinta-Piceance 70 Province Boundary

Green River 39° Green River Grand 70 Junction 50 Gunnison 50 UTAH Colorado160 River

38°

Index map EXPLANATION

Oil shale-bearing rocks Major highway or road City or town U.S. Geological Survey Oil and Gas Province

Enlarged area

Figure 2. Distribution of oil shale-bearing rocks in the Eocene Green River Formation in southwestern Wyoming, northwestern Colorado, and northeastern Utah.

4 Stratigraphic Cross Sections of the Eocene Green River Formation 8,000 FEET 8,000 EAST Formation Battle Spring Adobe Town Member Adobe Town Kinney Rim Member

Great Divide Basin Washakie Formation Washakie Wasatch Formation Wasatch Niland Tongue of Niland Tongue Ramsey Ranch Member of Wasatch Formation Wasatch Hartt Cabin Bed Green River Formation Godiva Rim Member of Tongue of Tongue Cathedral Bluffs Wasatch Formation Wasatch Bridger Formation

LaClede Bed

Laney Member of Member Laney Green River Formation River Green 150 MILES

Tipton Shale Member Tipton

of Green River Formation Rock Springs uplift Luman Tongue of Green River Formation Luman Tongue Rife Bed Sand Butte Bed Scheggs Bed

Freshwater lacustrine (lean) oil shale deposits Paludal (coal-bearing) deposits Saltwater lacustrine (rich) oil shale deposits Cyclic salt water lacustrine oil shale, evaporite, and mudflat deposits Mudflat and some saltwater lacustrine oil shale deposits

Green River Formation River Green

Wilkins Peak Member of Member Peak Wilkins Farson Sandstone Farson

EXPLANATION Member of Green River Formation River Green of Member Niland Tongue of Niland Tongue Wasatch Formation Wasatch Main body of Wasatch Formation Main body of Wasatch Green River Basin Craven Creek Bed Cow Hollow Bed Stratigraphic relations of Eocene rocks within the Greater Green River Basin, southwestern Wyoming. Gray or tan lacustrine sandstone deposits Gray or tan fluviovolcanic sandstone deposits Mixed tan or gray freshwater lacustrine and sandstone deposits gray or green flood-plain mudstone and sandstone deposits Red flood-plain deposits Gray and green floodplain deposits Arkose (pediment) deposits

Wasatch Formation Wasatch Alkali Creek Tongue of Tongue Creek Alkali

Tongue of Tongue

Eocene Cathedral Bluffs

Early Eocene Early

Middle Eocene Middle Formation Wasatch Figure 3. Whiskey Butte Bed Late WEST Cross Sections 5

Bed of the Laney Member. It is also interbedded with higher exploration, and 38 surface sections measured from outcrops amounts of sandstone and mudstone. within the Greater Green River Basin; table 1 provides an Following this regressive period, and subsequent deposi- explanation of the types of data that are presented in the tion of the Wilkins Peak Member of the Green River Forma- spreadsheet that accompanies this report (Spatial_Information. tion, Lake Gosiute expanded again. During this expansion, the xlsx). In a few cases, both oil-yield histograms and geophysi- lake covered a much larger area of the Greater Green River cal logs were available for the same well. The true tops and Basin than during Wilkins Peak time, as well as becoming bases of oil shale intervals, such as for the LaClede Bed and much deeper. This expansion is recorded in the rock record, Tipton Shale Member, can commonly be picked on geophysi- and is known as the Laney Member of the Green River Forma- cal logs. However, when these identified well depths are tion, named by Roehler (1973). The Laney Member contains compared to those reported for cuttings, there is commonly a the youngest oil shale-bearing strata that are included in the discrepancy owing to the difficulty in accurately compensat- USGS oil shale assessment; the richest oil shale beds are ing for the time delay between when a particular interval is found in the basal part of the member, known as the LaClede being drilled and when the cuttings from that interval reach Bed. In the eastern portion of the Greater Green River Basin, the surface. For this assessment, we chose to use the reported the LaClede Bed grades into the laterally equivalent Godiva tops at which the oil shale units were encountered in the Rim Member of the Green River Formation (Roehler, 1991e). cuttings, because using the geophysical log data would have The rich oil shale deposits of the LaClede Bed are interbed- resulted in portions of rich oil shale units being excluded in ded in some portions of the Greater Green River Formation many of the holes. The correlation datum for the cross sections by a tuffaceous siltstone layer informally known as the Buff was the bottom of the LaClede Bed of the Laney Member of Marker bed (Roehler, 1973). the Green River Formation, or laterally equivalent strata. A horizontal scale of 1 in = 2 mi and a vertical scale of 1.3 in = 100 ft were selected to best accommodate the lateral distances Cross Sections covered and to serve the need for stratigraphic detail. Sources of stratigraphic data for surface sections include (1) Roehler Of the 23 cross sections prepared for this assessment, (1981) for Section 27, Section 28, and Section 29 (pl. 15); (2) 10 were created from data in the Green River Basin west Roehler (1989a) for the Twenty Mile, Six Mile, Wilkins Peak, of the Rock Springs Uplift (pls. 1–10), 7 were created from and Red Creek #1 sections (pls. 4 and 15); (3) Roehler (1989b) data in the Washakie Basin east of the Rock Springs Uplift for the Vermillion Creek, Northeast Hiawatha, East Pioneer, (pls. 11–17), and 6 were modified from previously published Trail Dugway, Salt Wells, Salt Wells Axis, Eocene Reference, cross sections by Roehler (1990, 1991b, 1991c, 1991d, 1992a) Laney Point, West U.P. Springs, Luman Point, South Antelope, (pls. 18–23). All plates use the same formation tops that were LaClede Station, West Bitter Creek, Laney Dugway, Northeast used in the oil shale assessment of the Greater Green River Table Rock, West Tipton, and Alkali Creek sections (pls. 11, Basin (see Johnson and others, chapter 1, this report). 12, 13, 15, and 19); (4) Roehler (1989c) for the Agate Quarry, The cross sections (pl. 24) were constructed using 201 Barrel Springs Draw, Tipton Point, Red Creek #2, and Ridge of the existing 427 Fischer Assay oil-yield histograms, 11 Road sections (pls. 3, 14, 15, and 16); (5) Roehler (1990) for geophysical logs collected from wells drilled for oil and gas the Boar’s Tusk and Fontenelle Creek sections (pls. 4 and 20);

Table 1. Names and definitions for the column headers for the spatial-data spreadsheet (Spatial_Information.xlsx). Column name Column definition USGSID Unique ID assigned by staff geologist COMPANY Name of the company or agency that drilled the borehole NAME Name of the borehole assigned by the company or agency that drilled it SECTION Section TOWNSHIP Township RANGE Range LATITUDE Latitude, in decimal degrees, North American Datum 1927, software-calculated, original record LONGITUDE Longitude, in decimal degrees, North American Datum 1927, software-calculated, original record COUNTY Name of county in Wyoming DEPTH Total depth of the borehole, in ft CROSS SECTION The Green River Basin cross section where that piece of data can be found 6 Stratigraphic Cross Sections of the Eocene Green River Formation

(6) Roehler (1991d) for the North Sage Creek and Northeast Roehler, H.W., 1989a, Correlation of surface section of the Piedmont sections (pl. 21); (7) Roehler (1991c) for the Little intertongued Eocene Wasatch and Green River Formations Robber’s Gulch, East Flat Top, Flat Top, and East Salt Wells along the west flank of the Rock Springs uplift in southwest Axis sections (pls 22); and (8) Roehler (1992a) for the Little Wyoming: U.S. Geological Survey Miscellaneous Field Mountain section (pl. 23). Drill holes and measured sections Studies Map MF–2104. used in the plates are listed in the Spatial_Information.xlsx file Roehler, H.W., 1989b, Correlation of surface sections of the (chap. 5 folder) intertongued Eocene Wasatch and Green River Formations along the western margins of the Sand Wash Basin, northwest Colorado, and Washakie Basin, southwest Wyoming: References Cited U.S. Geological Survey Miscellaneous Field Studies Map MF–2105. American Society for Testing and Materials, 1980, Standard method of test for oil from oil shale: Annual Book of ASTM Roehler, H.W., 1989c, Correlation of surface sections of the intertongued Eocene Wasatch and Green River Formations Standards, Part 25, Designation D 3904-80, p. 513–515. along the central part of the Sand Wash Basin, northwest Bradley, W.H., 1959, Revision of stratigraphic nomenclature Colorado, and eastern part of the Washakie Basin, south- of Green River Formation of Wyoming: American Asso- west Wyoming: U.S. Geological Survey Miscellaneous ciation of Petroleum Geologists Bulletin, v. 43, no. 5, p. Field Studies Map MF–2106. 1072–1075. Roehler, H.W., 1990, West-east stratigraphic correlations of surface and subsurface sections of the intertongued Eocene Cashion, W.B, 1973, Geologic and structure map of the Grand Wasatch and Green River formations, northern Green River Junction Quadrangle, Colorado and Utah: U.S. Geological basin, Wyoming: U.S. Geological Survey Miscellaneous Survey Miscellaneous Investigations Series Map I–736, Field Studies Map MF–2149. scale 1:250,000. Roehler, H.W., 1991a, Revised stratigraphic nomenclature for Johnson, R.C., Finn, T.M., and Roberts, L.N., 2005, The the Wasatch and Green River Formations of Eocene age, Mesaverde Total Petroleum System, Southwestern Wyo- Wyoming, Utah, and Colorado: U.S. Geological Survey ming Province, in U.S. Geological Survey Southwestern Professional Paper 1506–B, 38 p. Wyoming Province Assessment team, ed., Petroleum systems and geologic assessment of oil and gas in he south- Roehler, H.W., 1991b, Correlation and depositional analy- western Wyoming Province, Wyoming, Colorado, and Utah: sis of oil shale and associated rocks in the Eocene Green U.S. Geological Survey Digital Data Series DDS–69–D, River Formation, Greater Green River Basin, southwest Chapter 8, 38 p. Wyoming: U.S. Geological Survey Miscellaneous Investi- gations Map I–2226. Johnson, R.C., and Roberts, L.N., 2003, Depths to selected stratigraphic horizons in oil and gas wells for Upper Creta- Roehler, H.W., 1991c, East-west surface and subsurface cor- ceous and Lower Tertiary strata of the Uinta Basin, Utah, in relations of the intertongued Eocene Wasatch and Green River Formations, Washakie basin, southwest Wyoming U.S. Geological Survey Southwestern Wyoming Province : Assessment team, ed., Petroleum systems and geologic U.S. Geological Survey Miscellaneous Field Studies Map MF–2164. assessment of oil and gas in he southwestern Wyoming Province, Wyoming, Colorado, and Utah: U.S. Geological Roehler, H.W., 1991d, West-east stratigraphic correlations Survey Digital Data Series DDS–69–B, chapter 13, 30 p. of surface and subsurface sections of the intertongued Eocene Wasatch and Green River formations, Wyoming: Love, J.D., and Christensen, A.C., 1985, Geologic Map of U.S. Geological Survey Miscellaneous Field Studies Map Wyoming: U.S. Geological Survey, scale 1:500,000. MF–2159.

Roehler, H.W., 1973, Stratigraphic divisions and geological Roehler, H.W., 1991e, Godiva Rim Member—A new strati- history of the Laney Member of the Green River Forma- graphic unit of the Green River Formation in Southwest tion in the Washakie Basin in southwestern Wyoming: U.S. Wyoming and Northwest Colorado: U.S. Geological Survey Geological Survey Bulletin 1372–E, 28 p. Professional Paper 1506–C, 17 p.

Roehler, H.W., 1981, Correlation of Eocene rocks in measured Roehler, H.W., 1992a, North-south correlation of oil-shale and sections in the southeast and west parts of the Rock Springs trona beds in the Eocene Green River Formation, southwest Coalfield, Wyoming: U.S. Geological Survey, Oil and Gas Wyoming: U.S. Geological Survey Miscellaneous Field Investigations Chart OC–111. Studies Map MF–2192. References Cited 7

Roehler, H.W., 1992b, Correlation, composition, areal distribution, and thickness of Eocene stratigraphic units, Greater Green River Basin, Wyoming, Utah, and Colorado: U.S. Geological Survey Professional Paper 1506–E, 49 p. Rowley, P.D., Hansen, W.R., Tweto, Ogden, and Carrara, P.E., 1985, Geologic Map of the Vernal 1° × 2° quadrangle, Colorado, Utah, and Wyoming: U.S. Geological Survey Miscellaneous Investigations Map I–1526, scale: 1:250,000. Smith, M.E., Carroll, A.R., and Singer, B.S., 2008, Synoptic reconstruction of a major ancient lake system—Eocene Green River Formation, western United States: Geological Society of America Bulletin v. 120, no. 1, 2, p. 54–84. Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geo- logical Survey, scale: 1:500,000. U. S. Geological Survey Uinta-Piceance Assessment Team, 2003, The Uinta-Piceance Province—Introduction to a geologic assessment of undiscovered oil and gas resources in U. S. Geological Survey Uinta-Piceance assessment team, compilers, Petroleum systems and geologic assessment of oil and gas in the Utah and Colorado: U.S. Geological Survey Digital Data Series DDS–69–B, 27 p. U. S. Geological Survey Southwestern Wyoming Province Assessment Team, 2005, The Southeastern Wyoming Prov- ince—Introduction to a geological assessment of undiscovered oil and gas resources in U.S. Geological Survey Southwestern Wyoming Province Assessment team, ed., Petroleum systems and geologic assessment of oil and gas in the southwestern Wyoming Province, Wyoming, Colo- rado, and Utah: U.S. Geological Survey Digital Data Series DDS–69–B, chapter 13, 30 p. Witkind, I.J., 1995, Geologic map of the Price 1° × 2° quadrangle, Utah: U.S. Geological Survey Miscellaneous Inves- tigations Series Map I–2462.

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