Title: K-Bentonites of the Ordovician Decorah subgroup, Upper Mississippi Valley
First published: 1986
Subjects: Bentonite, Geology, Stratigraphic, Stratigraphic Geology
Places: Mississippi River Valley
Time periods: Ordovician
LC classification: QE105 .A45 no. 537, QE391.B55 .A45 no. 537