National Geologic Map Database
General Information
- Title: 40Ar/39Ar ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana
- Author(s): M'Gonigle, J.W., and Dalrymple, G.B.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Bulletin 2132
- Publication Date: 1996
- Map Scale: 1:24,000
- Cross Section: Yes
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