In June, 1960, a 2-ft. post-Kansan peat deposit was exposed in a building excavation in Grinnell (Poweshiek Co.), Iowa. A Kansan gumbotil lies beneath the peat, and approximately 16 ft. of loess lies above it. Well-preserved wood and pollen of coniferous forest species are abundant. Because there is no overlying till, the deposit is tentatively classified as of Buchanan age.
Proceedings of the Iowa Academy of Science
©1962 Iowa Academy of Science, Inc.
Graham, Ben F. Jr.
"A Post-Kansan Peat at Grinnell, Iowa: A Preliminary Report,"
Proceedings of the Iowa Academy of Science, 69(1), 39-44.
Available at: https://scholarworks.uni.edu/pias/vol69/iss1/7