Clay Partings in Gypsum Deposits in Southwestern Indiana1

Jack L. Harrison and John B. Droste
Indiana Geological Survey, Bloomington, Indiana
Geology Department, Indiana University, Bloomington, Indiana
1 Published by permission of State Geologist.

Abstract: Gypsum deposits of Mississippian age in southwestern Indiana contain several argillaceous partings. A study of these partings was made to find out what clay minerals are present in such an evaporite association.

The most abundant minerals in the clay partings are dolomite, gypsum, quartz, illite, chlorite and mixed-layer illite-montmorillonite. No kaolinite was found in any of the samples.

Clays and Clay Minerals; 1958 v. 7; no. 1; p. 195-199; DOI: 10.1346/CCMN.1958.0070111
© 1958, The Clay Minerals Society
Clay Minerals Society (www.clays.org)