The work of Professor Shimek, of the Iowa Geological Survey, in western Iowa, has brought to light many exposures of Aftonian gravels and the underlying Nebraskan (pre-Kansan) drift. These exposures extend along practically the entire western border of Iowa.
Proceedings of the Iowa Academy of Science
©1913 Iowa Academy of Science, Inc.
Carman, J. Ernest
"Notes on the Nebraskan Drift of the Little Sioux Valley in Cherokee County,"
Proceedings of the Iowa Academy of Science, 20(1), 231-235.
Available at: https://scholarworks.uni.edu/pias/vol20/iss1/24