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Thickness of upper Cretaceous rocks from the base of the Niobrara Formation to the top of the Frontier Formation, including the Carlile shale, Greenhorn Formation, and Sage Breaks shale, Powder River Basin, Wyoming and Montana
- Author / Creator
- Available as
- Physical
Details
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- Creator
- Department of the Interior, United States Geological Survey ; by James E. Fox and Debra K. Higley
- Format
- Maps, Atlases
- Language
- English
- Contributors
- Publication
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- [Reston, Va.?] : The Survey, 1987
- Physical Details
-
- 1 map ; 55 x 55 cm., on sheet 78 x 79 cm
- OCLC
- ocm19586416
- Cartographic Data
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Scale 1:500,000, Lambert conformal conic proj(W 107⁰00ʹ--W 104⁰00ʹ/N 45⁰00ʹ--N 43⁰00ʹ).
- "Contour interval 20 feet."
- Distributed to depository libraries in microfiche.
- Includes index map and generalized stratigraphic column.
- Microfiche. [Denver, Colo. : U.S. Geological Survey, 1987?]. 1 microfiche ; 11 x 15 cm.