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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
  • North Latitude: 47° 45' 0" N (47.7500)
  • South Latitude: 47° 30' 0" N (47.5000)
  • East Longitude: 111° 0' 0" W (-111.0000)
  • West Longitude: 111° 15' 0" W (-111.2500)
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.