Geology of Big Horn County and the Grow Indian Reservation Montana
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Please do not destroy or throw away this publication. If you have no further use for it, write to the Geological Survey at Washington andlask for a frank to return it UNITED STATES DEPARTMENT OF THE INTERIOR Harold L. Ickes, Secretary GEOLOGICAL SURVEY W. C. Mendenhall, Director Bulletin 856 GEOLOGY OF BIG HORN COUNTY AND THE GROW INDIAN RESERVATION MONTANA WITH SPECIAL REFERENCE TO THE WATER COAL, OIL, AND GAS RESOURCES BY W. T. THOM, JR., G. M. HALL, C. H. WEGEMANN AND G. F. MOULTON UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1935 For sale by the Superintendent of Documents, Washington, D.C. - - - Price 60 cents (paper cover) CONTENTS Abstract. ____-_______-__--__---__--_--_----_--_ _---__--i -_--_--_ I Introduction....... _-________-____---__---_-_-_-_____-__-_-___-___ 3 Scope and purpose of the report.. _ __----___-____--________-___ 3 Location and geographic relations of the area. --____-_______-_ _ 3 History of the region__________._______________________________ 5 Legal status of the land _ ________________________________ _ __ 7 Field work... _ _.___--______------.__--___.__.___ ___ _ __ 8 Coal, oil, and gas_-_____________-___-_________.___________ 8 Ground water_-___.______- ____--.--__-. 9 Acknowledgments....--....--....-- ___________________________ 10 Geography ___-_____.____-_---_-_____---_--__-_.__________________ 12 Surface features and relief _ __________________________ _____ 12 Big Horn and Pryor Mountains _ __________________________ 13 Rosebud Mountains____________.______________________ _ _ 15 Plains.. _ _____ . _________________________ 17 . River valleys_-__-_____-____-_-._____________-___ _ _ ___ 18 Terraces. _-___________-___-___-____-_-________ 7 ___ _ .-_. 18 Drainage---___-_----___-_-___-___-----_- ____________ ___ ____ 19 General features____________________________________ _ ____ 19 Records of stream flow. __ _________________________ _ ____ 21 Irrigation by surface water__________. ________________ ____ ___ 23 Climate. ._-.----__-__-_- __ __ _ .__ _ _ _ . __ ________ _ 24 Vegetation and animal life______-__"______._____________________ 26 Industries-......-.-.--.--------- _____________________________ 26 Natural resources-_____---____--_---___-_-____________________ 27 Railroads and roads_________________________--______ ___ _____ 27 Stratigraphy __ __________________________________________ __ _ __ 28 Pre-Cambrian. _______________________________________________ 32 Cambrian system____________-_______________________ __ _____ 32 Deadwood formation_______________________.______________ 32 k Ordovician system. ____________________________________________ 32 Bighorn dolomite____-___-____-______-___________ _ ___ _ _ 32 ** Carboniferous system _ _______________________________________ 34 Mississippian series. _ _______________________________ _ ___ 34 Madison limestone_---_-_-_-__-_____-_________________ 34 . Pennsylvanian series.. _ __________________________________ 35 , Amsden formation____________________________________ 35 » Tensleep sandstone-_-___________--_-__________________ 37 Triassic system -_-____-_-____-___-__--_-_.______________ __ __ 38 " Chugwater formation_______________________________ _ _____ 38 Jurassic system____________________________________________ _ 39 Sundance formation__________________.____________________ 39 Morrison formation...... _________________________________ _ 40 m 491719 IV CONTENTS Stratigraphy Continued. page Cretaceous system ___________________________________________ 42 Lower Cretaceous series______.____________________________ 42 Cloverly formation.___________________________________ 42 Upper Cretaceous series.-^--_______________________________ 46 Colorado group_----_-------______________-___________ 46 Thermopolis shale_______________________________ 46 Mowry shale._--------___-_-____________________ 48 Frontier formation________________________________ 49 Carlile shale.._-_---__-__---___-_-__-__.----__-__.. 49 Niobrara shale_--_----____________._____________ 52 Montana group.______________________________________ 53 Telegraph Creek formation.._______________________ 53 Eagle sandstone.__-__-_-___-__i___________________ 56 Claggett shale.___________________________________ 58 Parkman sandstone.______________________________ 58 Bearpaw shale.-.-_--_--_______-____---_--__-_____ '60 Tertiary (?) system__________----____________-_-_____._-___ 60 Eocene (?) series_____-_________-____________._____________ 60 Lance formation______________________________________ 60 Hell Creek member.______________________________ 61 Tullock member______--______________-__-____-_._ 61 Tertiary system.....__________________________________________ 62 Eocene series-__-____-_________-__________-__-_____-__-__- 62 Fort*Union formation_______________________________ 62 Lebo shale member__-____-____-____--___________-_ 64 Tongue River member____.._______________.________ 64 Wasatch formation..__________________________________ 66 Tertiary and Quaternary systems (undifferentiated)-_____-____-___ 66 Structure--_-----_----_----_-_-_--.-----------_----_-------__-__-. 69 Big Horn and Pryor Mountain uplifts...________-_-__-_--_______- 69 Minor structural features._____________________________________ 71 Plum Creek anticline_-___--_-__-_-__----_--_-------__--__- 71 fc. Shively Hill dome-____.---_------------_----------------- 72 Birdhead dome_------------------_----_..-_-----_-__-----^ 72 Boundary dome_-_-_-____________________----____---_-__-_ 72 Mifflin anticline.---.----.---------------- -___.___ 73 Telegraph Creek plunging anticline-__ _-_____-_-__---______ 73 Beauvais Creel uplift--_------_----_--_--_------------ -_ 73 Grapevine dome.__._____--_-_-_--_______---------_--__-__ 74 .Sport Creek anticline.____--____-___--____----_--_-____._-_ 74 Sport Creek dome_____-_-___--_-__-__-___-----_-__-_-___ 74 . Willow Creek dome_______-_-_-------_--_-_---_-----_-.-_. 75 Heed dome-_---_--_-_--_-------------_-------------_----- 75 Soap Creek anticline.-.--------------------------------. - 75 .Soap Creek dome___-_----------_-----------------_-_- 75 Rotten Grass dome_____-_________________-_--___--_--___ 76 Woody Creek dome____-_----_-_-------__------- ___ 76 ^ Two Legging uplift--___-_-_----__^_--_----_-_----_.__ -_. 76 Tenmile plunging anticline.-.-------.-------------------- 76 Pine Ridge area-_--_-__------_--_-_----_----------_-_-_- 76 iNinemile and Dry Creek areas--__--_-_-----_----_--_------_ 76 East Tullock Creek dome._____.__.__._____________ 77 CONTENTS Structure Continued. Minor structural features Continued. East Sarpy anticline...------------- ___-.-_.-----__----. 77 Hardin gas field------------------------------------------- 77 Black Gulch dome_____-_____ _-- ------- __--__ 77 Aberdeen uplift._________----_--_-----_-------_----------- 78 Faults--------------------------------------------------- .78. Sandstone dikes. -___________-_-_-_---_-------------_--- 79* Geologic history...________-__--___-___-_---_--__-..----_--_------- SO" Economic geology.-.---------------------------------------------- 85» Coal..- ----------------------------------------------------- 85 Distribution and correlation of the coal b'eds_____---__._----_ 85 Coal in the Cloverly formation..--______-_---__-__-__-__ 86 Coal in the Parkman sandstone.--____-_____-__-___-____ 86 Coal in the Bearpaw shale....-_--________--_-_-___-__._ 86 Coal in the Lance formation and the Lebo member of the Fort Union formation_____________________________ 87 Coal in the Tongue River member of the Fort Union forma tion and in the Wasatch formation--...-.-- ________ 87 Physical properties._-____---___-_-_-__-____-______________ 88 Chemical properties._____-___-____----_-__-__----_________ 89 Burning of the coal beds..------..------------------------- 92 Development.____________-_-___-:_______----.___._____-__ 92 Township descriptions.---------------1--------------------. 92 Oil and gas_________________________________________________ 104 Ground water.________--_____----------_____-.___--._________ 124 Water-bearing properties of the rock formations ------------- 124 Alluvial and gravel deposits.___________________________ 125 Wasatch formation..___--___--_-___-__.__._-__________ 126 Fort Union formation.-__----_-_-___-____.__-________ 127 Tongue River member.--_-_-______________.__-__._ 127 Lebo shale member.______________________________ 127 Lance formation._____-_--_____-___-_-.______________- 127 Tullock member._________________________________ 127 HeU Creek member....__________...____ . 128 Montana group._______________________________________ 128 Bearpaw shale__-_--------_---______-___-________. 128 Parkman sandstone.______________________________ 128 Claggett shale__________________________________ 129 Eagle sandstone.__----___-_-___-_--_-______-____ 129 Telegraph Creek formation...______________________ 129 Colorado group.______________________________________ 130 Cloverly formation.-__---_--___-_-___-___-_______._.__ 130 Morrison formation_____--___-_-_-_________-__._______ 131 Sundance formation._----_-____-______________._______ 131. Chugwater formation____-_____________________.__-____ 131 Tensleep sandstone_----__-_-_-_-_______-__-____-___- 131 Amsden formation._-__-__--_-________________.______ 132 Madison limestone.____________________________________ 132 Bighorn dolomite._____--__-___-____________-___.__.._ 132 Deadwood formation._---_----_---____________________ 132 Igneous rocks.________________________________________ 133 Relation of rock structure to water supplies--___-_-__________ 133 Artesian conditions._-_____________________________________