USGS Logo Geological Survey Professional Paper 1356
Neogene Tectonics and Geomorphology of the Eastern Uinta Mountains in Utah, Colorado, and Wyoming





Regional setting

Gilbert Peak erosion surface

Extent in the Eastern Uinta Mountains

Wild Mountain upland surface

Bishop Conglomerate

General features and distribution
Lithology and thickness
Physical geography at the onset of deposition of the Bishop Conglomerate
     Altitude and relief
     Rates of uplift

Browns Park Formation

Post-Bishop, pre-Browns Park change in drainage direction
Age of the Browns Park Formation

Bishop Conglomerate beneath the Browns Park Formation

Critical relationship of the Browns Park Formation to the Bishop Conglomerate near Lily Park

Random relationship of the Browns Park Formation to the Gilbert Peak erosion surface


North flank
South flank
     Nonuniform tilting on the south flank
     West-to-east tilting on the south flank
          Cliff Ridge area
          Mud Springs Draw and Wolf Creek
Southeast end of the range
Northeast end of the range
Summary of post-Browns Park deformation
     Diamond Peak and Browns Park
     Yampa fault
     Deerlodge monocline

Drainage development

Adjustments on the south flank—in the Pot Creek area
Adjustments on Blue Mountain
Adjustments on the north flank
     Flaming Gorge area
     Vermillion Creek and Irish Canyon
Physiographic setting and development of Lodore Canyon
Yampa River
Postulated capture of the master drainage of the Green River basin
     Relationship of capture to fish faunas
Quaternary reentrenchrnent of the Green River

References Cited



FRONTISPIECE. View north up Lodore Canyon toward Browns Park.

1—5. Maps showing:

1. Regional setting of the Uinta Mountains

2. Pertinent features in the Eastern Uinta Mountains region

3. Structural setting of the Uinta anticline

4. Generalized structure of the Uinta Mountains

5. Distribution of Browns Park Formation, Bishop Conglomerate, and Gilbert Peak erosion surface

6. Photographs depicting character and extent of Gilbert Peak erosion surface

7. Composite profile of erosion remnants between Gilbert Peak and Green River airport

8—12. Photographs showing:

8. Aerial view, Davis Draw—Hoy Flat area

9. Remnants of the Gilbert Peak erosion surface in the easternmost Uinta Mountains

10. Gilbert Peak erosion surface forming east rim of Lodore Canyon

11. Wild Mountain as seen from "Harpers Plateau"

12. Felsenmeer on the Madison Limestone, Douglas Mountain

13. Map showing generalized distribution of Bishop Conglomerate and Browns Park Formation in southeastern Uinta Mountains

FIGURES, 14—16. Photographs of the Bishop Conglomerate:

14. At south end of Little Mountain

15. At southwest end of Little Mountain

16. Coarsening-upward sequence at Sand Wash

17. Diagram showing directions of deltaic foreset bedding in the Laney Shale Member of the Green River Formation and transport directions of the Bishop Conglomerate

18—20. Photographs showing:

18. Eolian crossbedding in the Browns Park Formation

19. Water-laid tuffs in the Browns Park Formation

20. Bishop Conglomerate resting on Morrison Formation

21. Sketch section showing relationship of Bishop Conglomerate to Browns Park Formation at canyon of Little Snake River

22. Photograph of basal conglomerate of Browns Park Formation resting on truncated Glen Canyon Sandstone

23. Aerial photograph over Browns Park looking north across Cold Spring Mountain

24. Diagram showing how a fault that initially controlled drainage can shift away from drainage during degradation

25. Generalized tectonic map of the Eastern Uinta Mountains

26. Cross section drawn to explain middle to late Tertiary deformation of the Gilbert Peak erosion surface

27. Map showing general extent of faults on north flank of Uinta Mountains between Flaming Gorge and Browns Park

28. Cross section showing displacement of Gilbert Peak erosion surface in the Goslin Mountain area

29. Geologic section showing northerly tilt of Gilbert Peak erosion surface on Blue Mountain

30. Structure map of base of Bishop Conglomerate showing post-Bishop warping and faulting of Gilbert Peak erosion surface, Diamond Mountain—Island Park—Blue Mountain area

31. Profiles along both flanks of Uinta Mountains, showing eastward decline in altitude of Gilbert Peak erosion surface

32. Photograph of Bishop-capped berm on the south flank of Stuntz Ridge

33. Structure map of the Bishop Conglomerate in the Wolf Creek area

34. Photograph from rim of Johnson Draw west-northwest along the Yampa fault

35—37. Maps showing:

35. Development of Green River from late Oligocene time to present

36. Barbed tributaries in Cart Creek area

37. Distribution of Bishop Conglomerate in Pot Creek area

38. Diagram demonstrating effect of tilt on the low point of a concave-upward profile

39. Drainage map of the Blue Mountain area

40. Sketch map of hills, drainages, and tectonic features of northeast flank of Uinta Mountains

41. Diagram showing subsidence of Bear Mountain and reversal of gradient of Gilbert Peak erosion surface

42. Geologic map of Vermillion Creek area affected by beheading of Irish Canyon

43. Photograph of Klauson Pasture, showing terrace incised below Bishop Conglomerate

44. Photograph of Yampa River emerging from Cross Mountain Canyon

45. Geologic map and section showing large, retrogressive landslides in Yampa Canyon

46. Block diagram of a retrogressive landslide

47. Photographs of Quaternary terraces in the Eastern Uinta Mountains area



1. Distance from nearest possible sources of Bishop Conglomerate and maximum observed sizes of clasts

2. Summary of Tertiary and Quaternary tectonic, geomorphic, and sedimentologic events

The relationship of a widespread erosion surface and its capping of conglomerate to the subsequent structural and drainage history of a classic region


Dallas L. Peck, Director

Library of Congress Cataloging in Publication Data
Hansen, Wallace R., 1920— Neogene tectonics and geomorphology of the eastern Uinta Mountains in Utah, Colorado, and Wyoming.
(Geological Survey professional paper; 1356)
Bibliography: p.
Supt. of Docs. No.: I 19.16:1356
l. Geology, Stratigraphic—Tertiary. 2. Geology—Uinta Mountains Region (Utah and Wyo.) 3. Geology—Colorado. 4. Geomorphology—Uinta Mountains Region (Utah and Wyo.) 5. Geomorphology—Colorado.
I. Title. II. Series.

QE691.H36 1986 551.7'86 85—600166

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Last Updated: 09-Nov-2009