In the region south of the Wisconsin Driftless area an old soil is occasionally found under the Kansan drift, generally resting on the bed rock, and often associated with laminated water-bedded clay and other silt. It is exposed under a bluff of drift in the southern part of Muscatine, Iowa. The material is here dark brown in color, mottled with small black fragments of vegetable tissue. The upper part is a dark mucky clay. The whole bed is only two or three inches in thickness. It lies below what appears to be pre-Kansan drift.
Proceedings of the Iowa Academy of Sciences
©1897 Iowa Academy of Science, Inc.
Udden, J. A.
"Some Preglacial Soils,"
Proceedings of the Iowa Academy of Science, 5(1), 102-104.
Available at: https://scholarworks.uni.edu/pias/vol5/iss1/17