National Geologic Map Database
General Information
- Title: Ordovician rocks of the northern Powder River basin and Black Hills uplift areas, Montana, Wyoming, and South Dakota
- Author(s): McCoy, M.R.
- Publishing Organization: Wyoming Geological Association
- Series and Number: Field Conference Guidebook no. 13 [p. 25-30]
- Larger Work: Bibb, T.W., Jr., chairman, Powder River basin
- Publication Date: 1958
- Cross Section: Yes
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- Wyoming Geological Association
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