TY  - BOOK
T1  - ⁴⁰Ar/³⁹Ar  ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana /
DA  - 19965.
CY  - Washington :
CY  - Denver, CO :
AU  - M'Gonigle, John W.
AU  - Dalrymple, G. Brent.
VL  - 2132
CN  - QE75
CN  - QE75
PB  - U.S. G.P.O. ;
PB  - For sale by the U.S. Geological Survey, Information Services,
PP  - Washington :
PP  - Denver, CO :
PY  - 19965.
N1  - "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."
N1  - One folded leaf of plates in pocket.
ID  - 178084
KW  - Igneous rocks
KW  - Argon-argon dating
KW  - Geology, Stratigraphic
TI  - ⁴⁰Ar/³⁹Ar  ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana /
ER  -