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Description

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....

Issue Number

15

Publication Date

1960

Stratigraphy and micropaleontology of the Thermopolis shale

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