Thickness of Upper Cretaceous rocks from the base of the Niobrara Formation to the base of the Clay Spur Bentonite (top of Lower Cretaceous rocks), Powder River basin, Wyoming and Montana
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| Description | article by J.E. Fox & Debra K. Higley-Feldman published 1987 in Open-File Report |
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author: Debra K. Higley-Feldman |
| Publication date | 1987 |
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