TY  - RPRT
TI  - 40Ar/39Ar age of the Manson, Iowa, impact structure and coeval impact ejecta in the Crow Creek member of the Pierre Shale, South Dakota and Nebraska
AU  - G. A. Izett
AU  - W. A. Cobban
AU  - G. B. Dalrymple
AU  - J. D. Obradovich
PY  - 1997
DO  - 10.3133/ofr97523
UR  - https://pubs.usgs.gov/publication/ofr97523
ID  - ofr97523
ER  -