Geologic map showing thickness of the upper Cretaceous Pierre Shale in the north half of the Powder River basin, southeastern Montana and northeastern Wyoming
Keyword(s):
1994 ◽
Keyword(s):
1995 ◽
Keyword(s):
Thickness of Parkman Sandstone Member of the Upper Cretaceous Mesaverde Formation and the Redbird Silty Member of the Pierre Shale, Powder River basin, Wyoming and Montana