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Loess over Kansan gumbotil, Benton Township, Hedrick, Iowa, June 29, 1925

Kansan topography, Welton Township, Iowa, June 18, 1925

Men on pile of boulders, Forest City township, Iowa, July 4, 1925

Loess and Iowan till, Windsor Township, Iowa, July 10, 1924

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

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

Nebraskan till and gumbotil, Clay Township, Iowa, June 28, 1925

Iowan till over Kansan gumbotil, soil on top of the gumbotil, Wayne Township, Iowa, July 8, 1924

Two tills and two loesses, Iowa, June 18, 1925

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

Iowan Drift area topography, Boulder Township, Iowa, June 19, 1925

Topography of Iowan Drift area, Massilon Township, Iowa, July 18, 1925

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

Boulder field in Iowan area, Williamstown, Iowa, June 19, 1926

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

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

West side of the Lake Calvin Basin seen from the heights north of Columbus Junction, Iowa, June 14, 1924

Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

Iowan topography in northwest Iowa, Liberty Township, Iowa, 1925

Gravels and till, Cherokee Township, Iowa, 1925

Gravels in till, north of Afton, Iowa, 1925

Relief in Kansan plain along tributary to Whitebreast Creek, Whitebreast Township, Iowa, June 29, 1924

Dean G.F. Kay's car, after wind storm

Wind-polished boulder west of Stanwood, Iowa, July 2, 1925

Pebble band in Iowan till, Liberty Township, Iowa, July 4, 1925

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

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

Pebble band on Iowan till, Fremont Township, Iowa, July 8, 1924

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

Top picture: Dodgeville peneplain at an elevation of 1260 ft., Asbury, Iowa, 1920s. Bottom picture: Lancaster peneplain northeast of Waukon, Iowa, 1920s

Iowan Drift area topography, Spring Rock Township, Iowa, June 18, 1925

Iowan Drift area topography, Massilon Township, Iowa, July 18, 1925

Cracked gumbotil and contact with loess above, Iowa, July 25, 1924

Iowan Drift area topography, Hazel Green Township, Iowa, June 19, 1925

Nebraskan till, Nebraskan gumbotil and Kansan till, Douglas Township, July 24, 1924

Lightening flashes in a storm, Fairmont Park, Council Bluffs, Iowa, July 07, 1925

Kansan gumbotil with Iowa topography in the background, Massilon Township, Iowa, July 18, 1925

Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924

Piled up outwash of gravels, Calumet, Iowa, July 7, 1925

Kansan gumbotil, Lincoln Township, Iowa, June 21, 1925

George F. Kay, Frank Leverett, and Paul MacClintock in the field at the Nebraskan gumbotil outcrop 4 miles northeast of Ricketts, Iowa, July 1925

West side of the Lake Calvin Basin seen from the heights north of Columbus Junction, Iowa, June 14, 1924

Erosion in till and loess, Cass Township, Iowa, July 18, 1924

Frank Leverett, George F. Kay, and Paul MacClintock in the field, Lime Springs, Iowa, July 4, 1925

Kansan gumbotil with Illinoian till above on Miller Farm, Washington Township, Iowa, July 10, 1925

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

Loess and Iowan till, Loveland, Iowa, 1925