Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (1210 total)

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

Cliff above 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.
Bluff on Upper Iowa River (formerly Oneota River), Saint Croix capped by Oneota, height 300 ft. plus, Iowa, late 1890s or early 1900s

Bluff on Upper Iowa River (formerly Oneota River), Saint Croix capped by Oneota, height 300 ft. plus, Iowa, late 1890s or early 1900s

Bear Creek, near the south of Allamakee Co.
Oneota valley from the south and peneplain, Iowa, late 1890s or early 1900s

Oneota valley from the south and peneplain, Iowa, late 1890s or early 1900s

Located in Twp. 99, R. VI, Section 36, N.W. gr., S.E. 1/4 in northeast Iowa.
Limestone cliff, Durango, Iowa, late 1890s or 1900s

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

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

Oneota River near Bluffton, Iowa, late 1890s 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

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.
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.
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