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Thickness of the upper Cretaceous Niobrara Formation, 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
-
- [Reston, Va.?] : The Survey, 1987
- Physical Details
-
- 1 map ; 55 x 55 cm., on sheet 78 x 79 cm
- OCLC
- ocm19586736
- Cartographic Data
-
Scale 1:500,000, Lambert conformal conic proj(W 107⁰00ʹ--W 104⁰00ʹ/N 45⁰00ʹ--N 43⁰00ʹ).
- "Contour intervals 25 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.