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Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s

Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s

Glacial planed pebbles from drift, Iowa City, Iowa, late 1890s or early 1900s

Glacial planed pebbles from drift, Iowa City, 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

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

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Located in Twp. 95, R.V. Section 34, S.W. gr. N.W. 1/4.
Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Located in Twp. 99, R.V. Section I, N.W. gr.
Oneota River near Bluffton, Iowa, late 1890s or early 1900s.

Oneota River near Bluffton, Iowa, late 1890s or early 1900s.

Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s

Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s

Quarry is about 100 feet above base of bluff in Oneota.
Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Located in Twp. 95, R.V. Section 34, S.W. gr., N.W. 1/4.
Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s

Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s

The height from the level of the stream to the line of contact is 94 feet.
Limestone cliff, Durango, Iowa, late 1890s or 1900s

Limestone cliff, Durango, Iowa, late 1890s or 1900s