⁴⁰Ar/³⁹Ar ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana
By: by John W. M'Gonigle and G. Brent Dalrymple.
Contributors: Dalrymple, G. Brent.
Series: Geological Survey bulletin ;; 2132; U.S. Geological Survey bulletin ;; 2132.
Publisher: U.S. G.P.O.; For sale by the U.S. Geological Survey, Information Services
Published: 1996
Place of publication: Washington; Denver, CO
Language: eng
Number of pages: 17
Subjects: Rocks, Igneous -- Montana.; Argon-argon dating -- Montana.; Geology, Stratigraphic -- Tertiary.
Notes: Includes bibliographical references (p. 6-7).
"A summary of ⁴⁰Ar/³⁹Ar age analyses of eighteen samples of volcanic rocks from the Challis Volcanic Group and a summary of basin stratigraphy in southwestern Montana."
One folded leaf of plates in pocket.