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In the Big Horn Basin of Wyoming, the Thermopolis shale (Lower Cretaceous) of U.S. Geological Survey usage consists of three mappable units; a lower sequence of black shale and prominent siltstones, the Muddy sandstone, and an upper sequence of black shale and a few bentonites....
stratigraphy, micropaleontology, Thermopolis shale
Eicher, Don L.. 1960. "Stratigraphy and micropaleontology of the Thermopolis shale." Bulletin of the Peabody Museum of Natural History , (15). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/15