During the progress of the soil survey of Jefferson County, Iowa observations of the Kansan gumbotil and the overlying loess have revealed a limited number of locations in this county and in adjacent Van Buren County in which there is a very uneven boundary between these two materials. This deformation of the gumbotil and loess contact appears to be attributable to periglacial conditions prevalent during a part of the Pleistocene.
Proceedings of the Iowa Academy of Science
©1953 Iowa Academy of Science, Inc.
Schafer, George M.
"A Disturbed Buried Gumhotil Soil Profile in Jefferson County, Iowa,"
Proceedings of the Iowa Academy of Science, 60(1), 403-407.
Available at: https://scholarworks.uni.edu/pias/vol60/iss1/52