Wyoming State Geological Survey
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Wyoming State Geological Survey

Wyoming State Geological Survey -- Wyoming Stratigraphy





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Bighorn Basin (Entire Geological Time Period)

Bighorn Basin (Entire Geological Time Period) Fort Union Formation Chugwater Formation Cloverly Formation Cody Shale Frontier Formation Lance Formation Meeteetse Formation Mesaverde Formation Mowry Shale Muddy Sandstone Footnotes (6) Footnotes (14) Footnotes (51) Footnotes (52) Footnotes (78) Footnotes (58) Footnotes (58) Footnotes (65) Footnotes (60) Footnotes (1) Massive sandstone from the Tongue River Member of the Fort Union Formation along county road 26 near Greybull, WY, picture by Nikolaus Gribb. Soft silt stones. The red color in the red beds is from hematite in its matrix. Photo by Ryan O’Donnell. Black and gray soft laminated shales. Bentonite and ironstone concretions are common. Photo by Ryan O’Donnell.





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