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Cedar River from top of Old McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s

Man standing in cut for the foundation of women's gymnasium shows Loess overlying Buchanan Gravels, The University of Iowa, late 1890s or early 1900s

Iowa River and bluff above Turkey Creek, Iowa City, Iowa, late 1890s or early 1900s

Saunders Mill, Old Terrell Mill and dam on the Iowa River north of Iowa City, Iowa, late 1890s or early 1900s

Hutchinson's Quarry, Iowa City, Iowa, 1896

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

Outlier of Carboniferous sandstone, Iowa City, Iowa, late 1890s or early 1900s

Geological Lecture Room, Old Science Hall, The University of Iowa, December 13, 1899

Geology Club, The University of Iowa, May 7, 1934

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Interurban cut west of the Iowa River, Iowa City, Iowa, 1917

Topographic setting of the first Interurban cut (north of the Upper Interurban bridge) with folded and contorted Buchanan Gravels, Iowa City, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, 1890s

Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s

Geological chart of Iowa in Geological Lecture room, Old Science Hall, The University of Iowa, December 13, 1899

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s

Geology Club on the steps of Old Science Hall, The University of Iowa, May 24, 1916

Observatory Hill above the Iowa River, Iowa City, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Professor Samuel Calvin and class at the state quarry, North Liberty, Iowa, April 22, 1899

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

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

Contact of Carboniferous with Devonian showing unconformity, Iowa City, Iowa, 1890s

Geological Laboratory, Old Science Hall, The University of Iowa, December 13, 1899

Fish teeth from the Upper Devonian, Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s

Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s

The winding way, Iowa City, Iowa, late 1890s or early 1900s

Local dip in Devonian limestone on Rapid Creek, Graham Township, Iowa, 1890s

Clear Creek, a prairie stream, west 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

Iron bridge with piers of Devonian Limestone, North Liberty, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

West bank of the Iowa River, Iowa City, Iowa, late 1890s or early 1900s

Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s

North valley wall showing gradation from Iowan aqueous and silts upward into loess one mile north of Helman sand pit, Iowa City, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Dr. W. S. Williston, American Geologist, The University of Iowa, late 1890s or early 1900s

Glacial planed limestone, west of Clear Creek near the old woolen mill, Iowa City, Iowa, late 1890s or early 1900s

Professor Samuel Calvin and class, Solon, Iowa, 1900

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

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

Museum specimens, New Science Building, University of Iowa, late 1890s or early 1900s

North wall of Iowa River valley, west of Helman sand pit, showing terrace-like feature, Iowa City, Iowa, late 1890s or early 1900s