he Aftonian deposits of southwestern Iowa have peculiar interest in that within the area is the type locality for the Aftonian. So far neither the drift of the region nor the Aftonian as a unit has received a general discussion. The references to the beds extant are merely incidental to broader studies. The type locality and several other critical exposures have been visited by many geologists but no one has presented a complete account of the beds in question.
Proceedings of the Iowa Academy of Sciences
©1897 Iowa Academy of Science, Inc.
Bain, H. Foster
"The Aftonian and Pre-Kansan Deposits in Southwestern Iowa,"
Proceedings of the Iowa Academy of Science, 5(1), 86-101.
Available at: https://scholarworks.uni.edu/pias/vol5/iss1/16