Title: Bentonite deposits of the northern Black Hills district, Wyoming, Montana, and South Dakota
First published: 1962
Subjects: Bentonite deposits, Economic Geology, Geology, Economic, Geology, Stratigraphic, Groups (Stratigraphy), Stratigraphic Geology
Places: Butte County, Carter County, Crook County, Montana, South Dakota, Wyoming
Time periods: Cretaceous