The southern margin of the main Iowan drift sheet extends in a sinuous line across the central portion of Tama County. From this border a tongue-shaped lobe, having an average width of about six miles, extends southward for a distance of eight or nine miles reaching one mile below the city of Toledo and within two miles of the Iowa River. This extension I have called the Toledo lobe of Iowan drift.
Proceedings of the Iowa Academy of Sciences
©1902 Iowa Academy of Science, Inc.
Savage, T. E.
"The Toledo Lobe of Iowan Drift,"
Proceedings of the Iowa Academy of Science, 10(1), 123-135.
Available at: https://scholarworks.uni.edu/pias/vol10/iss1/23