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Collection: Calvin Geological Photographs
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Panorama of Kansan section of Peorian loess on Kansan gumbotil shown in Neg. 7441, Oregon Township, Iowa, August 1933
Located in NW 1/4, section 34 of Oregon Twp. Neg. 7441 can be seen here http://cdm.lib.uiowa.edu/u?/calvin,352
Palisades, Silurian stratigraphy and the Cedar River from the cave, Mount Vernon, Iowa, late 1890s or early 1900s
Palisades or high cliff above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s
Palisades on the right bank of the Cedar River above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s
Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s
Pahoid Hill in Iowan Lobe, Iowa, late 1890s or early 1900s
Paha, Stanwood, Iowa, late 1890s or early 1900s
Oxford Mills on the Wapsipinicon River, Oxford Mills, 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
Located in Twp. 99, R.V. Section I, N.W. gr.
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
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