TY  - RPRT
TI  - Lower Cretaceous bentonitic strata in southwestern Montana assigned to Vaughn Member of Mowry Shale (East) and of Blackleaf Formation (West)
AU  - R. G. Tysdal
AU  - T. S. Dyman
AU  - D. J. Nichols
PY  - 1989
UR  - https://pubs.usgs.gov/publication/70015897
ID  - 70015897
ER  -