Two Pleistocene eolian deposits, the Loveland loess and the Peorian loess, have wide distribution in Iowa. The Loveland loess, the older, was deposited, wholly or in large part, in an interglacial age - in late Sangamon time; the Peorian loess, the younger, was deposited in a glacial age - in the Iowan phase of the Wisconsin Age.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Kay, Geo. F. and Miller, Paul T.
"The Loveland and Peorian Loesses of Iowa,"
Proceedings of the Iowa Academy of Science, 43(1), 245-247.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/60