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Geological Survey Professional Paper 1356
Neogene Tectonics and Geomorphology of the Eastern Uinta Mountains in Utah, Colorado, and Wyoming |
TABLE OF CONTENTS
Regional setting
Acknowledgments
Extent in the Eastern Uinta Mountains
General features and distribution
Lithology and thickness
Sandstone
Tuff
Physical geography at the onset of deposition of the Bishop Conglomerate
Altitude and relief
Rates of uplift
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
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
ILLUSTRATIONS
FIGURES
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
TABLES
TABLE
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
UNITED STATES DEPARTMENT OF THE INTERIOR
DONALD PAUL HODEL, Secretary
GEOLOGICAL SURVEY
Dallas L. Peck, DirectorLibrary 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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