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Nebraskan gumbotil with till above (Kansan) and till below, concretions below and pebbles above mark the gumbotil, Poe Township, Iowa, July 25, 1924

Nebraskan gumbotil with till above (Kansan) and till below, concretions below and pebbles above mark the gumbotil, Poe Township, Iowa, July 25, 1924

Located in Poe Twp., looking north just east of Sections 2, 3, 10, 11.
Kansan till and gumbotil with Illinoian till above on the back of Gus Miller's farm, Washington Township, June 21, 1924

Kansan till and gumbotil with Illinoian till above on the back of Gus Miller's farm, Washington Township, June 21, 1924

Located in Washington Twp. southeast corner Section 28.
Kansan till, loess and Wisconsin till, Cass Township, Iowa, July 18, 1924

Kansan till, loess and Wisconsin till, Cass Township, Iowa, July 18, 1924

Located in Cass Twp. in the middle of north line of south Section 6 just west of Panora.
Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

View from north of Mississippi River in Washington Twp., S.E. quarter Section 33.
Kansan gumbotil, soil, and Iowan till, Wayne Township, Iowa, July 8, 1924

Kansan gumbotil, soil, and Iowan till, Wayne Township, Iowa, July 8, 1924

Located in Wayne Twp. near middle of north line of Section 30 looking east.
Kansan gumbotil covered with Iowan till with background of Iowan constructional topography; Windsor Township, Iowa, July 10, 1924

Kansan gumbotil covered with Iowan till with background of Iowan constructional topography; Windsor Township, Iowa, July 10, 1924

View looking southeast of Section 16.
Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Located in Washington Twp., S.E. quarter Section 33. Photographed from the edge of bluffs above Fort Madison.
Little Brown Church in the Vale, Bradford Congregational Church known as the "Little Brown Church in the Vale" located 2 miles northeast of Nashua, Iowa, July 12, 1924

Little Brown Church in the Vale, Bradford Congregational Church known as the "Little Brown Church in the Vale" located 2 miles northeast of Nashua, Iowa, July 12, 1924

Crumbling granite boulder, English Township, Iowa, June 30, 1924

Crumbling granite boulder, English Township, Iowa, June 30, 1924

Located in English Twp., middle of N.W. Section 23.
Kansan gumbotil with Iowan till above, gumbotil line marked by cleared area and field bag, Wayne Township, Iowa, July 08, 1924

Kansan gumbotil with Iowan till above, gumbotil line marked by cleared area and field bag, Wayne Township, Iowa, July 08, 1924

Located in Wayne Twp. near middle of north line of Section 30. View looking southwest.