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Wyoming State Geological Survey -- Wyoming Stratigraphy





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Black Hills (Entire Geological Time Period)

Black Hills (Entire Geological Time Period) Footnotes (14) Footnotes (27) Footnotes (26) Footnotes (41) Footnotes (79) Footnotes (74) Footnotes (80) Footnotes (76) Sundance Mountain is a 46 to 50 Ma quartz latite intrusion in the Sundance 30’x60’ Quadrangle. Relatively deep-red adjacent to the mountain is the combined Jurassic Sundance and Gypsum Springs formations. More subdued flat-topped surfaces in the foreground are underlain by the Triassic/Permian Spearfish Formation. Mountain behind the right side of Sundance Mountain is Black Buttes, a combination of similar aged trachytic and phonolitic intrusives, surrounded in part by upturned Paleozoic sedimentary rocks. View is to the southeast from the Bear Lodge Mountains. Photo by Wayne Sutherland.





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