Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (61242 total)

Cracked gumbotil and contact with loess above, Iowa, July 25, 1924
Relief in Kansan plain along tributary to Whitebreast Creek, Whitebreast Township, Iowa, June 29, 1924
Kansan gumbotil with Iowan till above, gumbotil line marked by cleared area and field bag, Wayne Township, Iowa, July 08, 1924
Crumbling granite boulder, English Township, Iowa, June 30, 1924
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
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