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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Man in front of section of Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Located west of Graf.
Shearing, Specht's Ferry, Iowa, late 1890s or early 1900s
Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s
Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s
Located in the R.W. Section 16, S.W. gr., N.E. 1/4.
Cliff of Trenton Limestone on the Oneota 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
Plymouth Rock above the Iowa river, Bluffton, Iowa, late 1890s or early 1900s
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
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
Bear Creek, near the south of Allamakee Co.
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