Geologic map showing thickness of the upper Cretaceous Pierre Shale in the south half of the Powder River Basin, northeastern Wyoming and adjacent areas

I-2380-B Geologic map showing thickness of the upper Cretaceous Pierre Shale in the south half of the Powder River Basin, northeastern Wyoming and adjacent areas, scale 1:200,000, 1993, ISBN 978-0-607-79548-6 Keywords: Powder river basin, Stratigraphic Geology, Stratigraphy, Geologic maps, Sedimentology, Sedimentary and carbonate rocks