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Cladopora iowensis from Butler's Landing north of Iowa City, Iowa, late 1890s or early 1900s

Cladopora Iowensis from Butler's Landing north of Iowa City, Iowa, late 1890s or early 1900s

Rocks in front of Old Science Hall, The University of Iowa, late 1890s or early 1900s

Kansan section showing Peorian loess on Kansan gumbotil, oxidized and leached till, ox, and unleached till, Oregon Township, Iowa, August 1933

Located in Oregon Twp., along Primary 161, at top of hill, South of Long Creek, NW 1/4, section 34, showing roadway.

Kansan gumbotil overlain by Peorian loess, Oregon Township, Iowa, August 1933

Oregon Twp., NW 1/4, section 34

Panorama of Kansan section of Peorian loess on Kansan gumbotil shown in Neg. 7441, Oregon Township, Iowa, August 1933

Located in NW 1/4, section 34 of Oregon Twp. Neg. 7441 can be seen here http://cdm.lib.uiowa.edu/u?/calvin,352

Flat Iowan drift plain in foreground and Loess mantled Kansan drift in the background, North Liberty, Iowa, August 1933

Located northeast of North Liberty, center of section 1, Penn Twp.

Geology Club, The University of Iowa, January 26, 1942

Hertha Limestone located about 200 feet west of Iron Bridge and south of Squaw Creek, Osceola Township, Iowa, late 1890s or early 1900s

Located in Osceolo Twp., about 200 feet West of Iron Bridge, South of Squaw Creek, in the NW 1/4 of the NW 1/4 of section 6.

Bethany Falls Milestone, Clarke County, Iowa, late 1890s or early 1900s

Ward Twp., SE 1/4 of the NE 1/4 of section 2

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