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University Microfilms, Inc., Ann Arbor, Michigan the DEVONIAN SYSTEM in WESTERN WYOMING

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University Microfilms, Inc., Ann Arbor, Michigan the DEVONIAN SYSTEM in WESTERN WYOMING This dissertation has been 65—13,200 microfilmed exactly as received BENSON, Anthony Lane, 1939- THE DEVONIAN SYSTEM IN WESTERN WYOMING AND ADJACENT AREAS. The Ohio State University, Ph.D., 1965 Geology University Microfilms, Inc., Ann Arbor, Michigan THE DEVONIAN SYSTEM IN WESTERN WYOMING AND ADJACENT AREAS DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of Hie Ohio State University By Anthony Lane Benson, B. S The Ohio State University 1965 Approved by A dviser Department of Geology This dissertation has boon 05—13,200 microfilmed exactly as received BENSON, Anthony Lane, 1939— THE DEVONIAN SYSTEM IN WESTERN WYOMING AND ADJACENT AREAS. The Ohio State University, Ph.D., 1905 Geology University Microfilms, Inc., Ann Arbor, Michigan THE DEVONIAN SYSTEM IN WESTERN WYOMING AND ADJACENT AREAS DISSERTATION Presented In Partial Fulfillment of the Regulresents for the Degree Doctor of Riilosophy In the Graduate School of Uie Ohio State University By Anthony lane Benson, B. S lhe Ohio State University 1965 Approved by A dviser Department of Geology VITA Noveetoer 1939 Born - Cleveland, Ohio 1961 B. S., The Ohio State tfelverslty, Coluribus, Ohio 1961 Field Assistant, United States Geological Survey, Denver, Colorado 196I- 196U Graduate Teaching Assistant, The Ohio Stats Uhlverslty, Coluntme, Ohio 196^ Geologist, The California Company, Jackson, Klssisslppl 1965 Instructor, The Ohio State Uhlverslty, Lina Branch, U na, Ohio 1965- Geologist, Itan American Petroleum Corporation, Oklahoma City, Qklahosm 11 CONTENTS introduction............................................................................ 1 Purpose and Scope 1 P revious Work 5 Methods of Investigation 7 Acknowledgments 7 Nomenclature 8 MAYWOOD FORMATION............................................................... 11 P revious Work 11 Description 12 Regional Distribution 13 O eneral sta te m e n t 13 Western Montana 13 West-central Montana lk Southwestern Montana 16 East-central Idaho 16 Southeast Idaho, Utah, and Nevada 16 Southern Montana 17 Wyoming 19 Relation to Lover Devonian Rocks 21 Age 22 JE FFERSON FORMATION.......................................................... 23 Lover Member 2k P revious Work 2k Description and Petrography 27 Intraforaational Correlation 30 Detrltal Interbeds 31 Limestone and dolomite distribution 3? FOssll beds 39 Regional Distribution kl West-central Montana kl Southern Montana-northern Wyoming kl Southwestern Montana and east-central Idaho k$ Western Wyosdng k6 Green River Basin 50 Darby Formation 53 Original definition 53 Use o f term 5k Llthologlc correlation 55 Restriction of term Darby 5? Different usage 56 Ob scription 58 Reference section 59 Distribution 60 Discussion 60 111 CONTENTS (continued) Pnge B lrd b ear Member 63 Definition and Previous Work 63 Description 63 Distribution 6^ Jefferson Formation Undifferentiated 69 Introduction 69 Western Montana 70 Northwestern Montana 72 East-central Idaho 73 Southeastern Idfiho and Northeastern Utah 7^ Central and Western Utah 79 Sedimentation and Origin 61 Age BU THREE PORKS FORMATION................................................................... 80 P rev io u s Work 00 Logan Gulch and Trident Members 09 F a c ie s 90 Areal Distribution 97 Belrdneau Formation 99 Description 99 Stratlgraphlc Correlation 100 Distribution 100 Utah Arch 101 Sapplngton Member 103 Age of Three Forks Formation 103 DARK SHA1E UNIT............................................................................................ 109 SUM4ARY............................................................................................................. 116 APPENDIX............................................................................... 121 BIBLIOGRAPHY................................................................................................ 13* lv ILLUSTRATIONS F ig u re ffcg* 1. Index nap showing location of area. j . 2 2. Physiography and locations of sections* . 3 3. Areas of recent stratigraphic work.................... 6 U. Regional correlation chart of the Devonian System .................................................................... 9 5. Isopach nap of ffeywood Formation......................... 15 6. Distribution of Lower Devonian and basal Upper Devonian detrital rocks .... 10 7. Fence diagram of Jefferson Formation. 25 8. Isopach map of Jefferson Formation. .... 26 9. Percentage of Lower Member containing sand. 3^ 10. Limestone percentage of nondetrital carbonates in Lower Member............................................. 37 11. Lower Member of Jefferson Formation in southwestern Montana..................................... **>3 12. Lower Member of Jefferson Formation, southern Montana-northern Wyoming...................... M 13* Lower Member of Jefferson Formation in western Wyoming................................................ **7 lU. Devonian System from Teton Range to Owl Creek Mountains................................................ MJ 15. Devonian 8ystem from Teton Range to Wind River Mountains.............................................. **9 16. Devonian System from Green River basin to northeastern U tah......................................... 51 17. Devonian rocks at Darby Canyon. ...... 57 v ILLUSTRATIONS (continued) Figure Rage 18. Birdbear Member at Taylor Mountain, Teton Range....................................................... 65 19. Schematic cross section of Devonian strati- graphic relations in west-central W yom ing................................................................ 67 20. Isopach map of Birdbear Member ............................. 68 21. Devonian System from Montana to northern U tah......................................................................... 71 22. Structure and distribution of Devonian rocks in southeastern Idaho and northeastern U tah ......................................................................... 78 2 3. Fence diagram of Three Forks Formation. 91 2k. Lithofacies map of lower third of Three Forks Formation (mostly Logan Gulch M em b er) ................................................................ 92 25. Lithofacies map of middle third of Three Forks Formation (mostly Trident Member) . 96 26. Isopach map of Logan Gulch and Trident Members of the Three Forks Formation................... 98 27. Schematic cross section of Devonian System in northeastern U tah......................................... 102 28. Type section of dark shale u n it ......................... 110 29. Isopach map of dark shale unit.............................. 113 30. Age of Devonian rocks................................................ 115 31. Areal distribution of stratigraphic units in w e stern Wyoming and a d ja c e n t a r e a s .................................................. 118 List of Tbbles Thble 1. Location of sections.................................................... ^ 2. Lithologic symbols.............................................. **2 vi INTRODUCTION Purpose and Scope The purpose of this study is to determine the regional strBtigraphic relations of De' O! iar' ro- ks in western Wyoming, southwestern Montana, eastern Idaho, and northeastern Utah. Although the investigation is primarily on the Jefferson Formation of Late Devonian age, associated units are also discussed. These include the Maywood, Darby, Three Forks, and Beirdneau Formations, and a dark shale unit of Devonian and Mississippian ag e. The most import- nt information evolving from the study concerns the stratigm phic relations between the Jefferson and Three Forks Formations of Montana and the Darby Formation of west-central Wyoming. Most of the area (Fig. l) was a widespread shelf in late Devonian time that extended from the eastern Dakotas to western Montana and western Wyoming. A miogeosyncline occupied the western portion of the area. Latest Devonian erosion restricted the eastern and southern extent of De-onian rocks. The shelf area lies west and south of the central Montana uplift and north of the Uinta arch, and includes the Te^doy dome along the Idaho-Montana border. The locations of the 7^> sections measured by the w riter are shown in Figure 2, and information on localities is sunmarized in Table 1. • MAT PALL* • UTTf DILLON I COOT ;SODA -•AN I NOS •ALT L A M CITY NEVADA • calc n >* Fig. 1. Index map shoving location of area 3 '■I'tnt M u d i n 3 T 42] 43 44 ■r« 99 19* 97 / 104 96 if 77 * <J*rs»04 * *OuW# _jf (Q; *3* 495 . »6f . 494 6?t *90 . ■ o c ■ Fig. 2. Physiography and locations of sections 1* TABLE 1 Location of measured sections 1 . Logan, Mont. 25-2N-2E 73- ClarkB Fork,Wyo. 7-56N-103W 2. Camp C reek, Mont. 20-2S-8W 75. Shoshone Canyon,Wyo.5-52N-102W 3. Sugarloaf Mtn.,Mont. 27-3W-HW 76. Teton Creek, Wyo. 29-W+N-117W 5- B oulder C reek, Mont . 1U-8N-13W 77. Glory Mtn., Wyo. 19-U1N-117W 7. Elliston, Mont. 1 - 10N-7W 78. Stouts Mtn., Ida. 36- 3N-U3E 1 0 . Rock Creek, Mont. 29-*+N-lUW 79- Baldy Mtn., Ida. 7-lN-**5E 11. Foster Creek, Mont. 6-5N-12W 8 0. Bedford, Wyo. 26-3**N-110W 13- Argenta, Mont. 35-6S-11W 8 1. LaBarge Mtn., Wyo. 1-26N-11UW 1U. Horse Prairie Cr., 82. Monroe Canyon, Ida. 32-7S-UOE * Mont. 31-9S-10W CD Bancroft, Ida. 2-108-39E 15. Kate Creek, Mont. 27-12S-11W 6k. Soda Springs, Ida. 28-8S-U1E 17. ''shbough Canyon,Mont. 27-9S-8W 86. Berry Creek, Wyo. 26-U7N-II6W 1 8. Sunset Peak, Mont. 21+-11S-5W 89. Trout Creek, Wyo. 5-2S-2W 2k. Cabin Creek, Mont. 15-11S-3E 90. Sinks Canyon, Wyo. 18-32N-100W 25- Targhee Peak, Ida. 1U-16N-U3E 91. N. Fk. Popo Agie River, mea­
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