National Geologic Map Database
General Information
- Title: Geologic map of the Portage quadrangle, Cascade and Choteau Counties, Montana
- Author(s): Maughan, E.K., and Lemke, R.W.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Miscellaneous Investigations Series Map I-2196
- Publication Date: 1991
- Map Scale: 1:31,680
- Cross Section: None
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- For more information, please contact:
- U.S. Geological Survey
- USGS Information Services
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- Phone: (303) 202-4700 or 1-888-ASK-USGS
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.