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Collection: Calvin Geological Photographs
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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
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
The height from the level of the stream to the line of contact is 94 feet.
Limestone cliff, Durango, Iowa, late 1890s or 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.
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.
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.
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
Plymouth Rock above the Iowa river, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s
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