TY  - RPRT
TI  - 40Ar/39Ar ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana
AU  - John W. M’Gonigle
AU  - G. Brent Dalrymple
PY  - 1996
DO  - 10.3133/b2132
UR  - https://pubs.usgs.gov/publication/b2132
ID  - b2132
ER  -