Geologic and structure map, with contours on top of the Pierre Shale, for the north half of the Powder River basin, southeastern Montana and northeastern Wyoming
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Geology topics
G.L. Sims
Publications and source records attributed to G.L. Sims.
Geologic map showing thickness of the upper Cretaceous Pierre Shale in the south half of the Powder River Basin, northeastern Wyoming and adjacent areas
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