Few discoveries of giant beaver, Castoroides, remains have been made in Iowa and these have usually been found under circumstances precluding determination of their geologic ages. The specimen reported herein from near Garner, Hancock County, Iowa, was recovered from a peat bed which lies within the border of a late Wisconsin, probably Cary, terminal moraine. According to radiocarbon dates recently announced for organic muck overlying till in a nearby peat bog the minimum date for the till would have to be approximately 12,000 b.p., thus older than Two Creeks interstadial. This find, places the giant beaver in Iowa during Two Creeks time or possibly slightly later. This is the latest survival yet reported for this form in Iowa and compares favorably with its terminal date reported in Ohio. Other giant beaver finds in Iowa are described and some general statements are made about the development of this animal.
Proceedings of the Iowa Academy of Science
©1962 Iowa Academy of Science, Inc.
Frankforter, W. D.
"A Late Wisconsin Giant Beaver in Northern Iowa,"
Proceedings of the Iowa Academy of Science, 69(1), 350-353.
Available at: https://scholarworks.uni.edu/pias/vol69/iss1/56