Johnson County offers a field of phenomena that are strikingly applicable to the theme of our late Pleistocene controversy, namely. “Has the northeast quarter of Iowa, except the Driftless Area, been invaded by an ice-sheet later than the Kansan?”
Proceedings of the Iowa Academy of Science
©1913 Iowa Academy of Science, Inc.
Leighton, Morris M.
"Additional Evidence of Post-Kansan Glaciation in Johnson County, Iowa,"
Proceedings of the Iowa Academy of Science, 20(1), 151-256.
Available at: https://scholarworks.uni.edu/pias/vol20/iss1/26