⁴⁰Ar/³⁹Ar ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana
- by John W. M'Gonigle and G. Brent Dalrymple.
- Washington : U.S. G.P.O. ; Denver, Colo. : For sale by Information Services, 1996.
- Physical description
- iii, 17 p. : maps ; 28 cm.
- U.S. Geological Survey bulletin ; 2132.
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