National Geologic Map Database
General Information
- Title: Stratigraphy and geologic history of Montana Group and equivalent rocks, Montana, Wyoming, and North and South Dakota
- Author(s): Gill, J.R., and Cobban, W.A.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Professional Paper 776 [37 p.]
- Publication Date: 1973
- Map Scale: 1:4,224,000
- Cross Section: Yes
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Geologic units referred to in Geolex
* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.