Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (62021 total)

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924
Kansan gumbotil, soil, and Iowan till, Wayne Township, Iowa, July 8, 1924
Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924
Kansan till, loess and Wisconsin till, Cass Township, Iowa, July 18, 1924
Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924
Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924
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