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Collection: Calvin Geological Photographs
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Geological Laboratory, Old Science Hall, The University of Iowa, 1899
Geological Laboratory, Old Science Hall, The University of Iowa, December 13, 1899
Morainic knob, Carroll, Iowa, late 1890s or early 1900s
West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s
Photograph taken from Mill.
Thin bedded Niagara and flagstone beds of Syringopora tenella zones in the upper cliffs, Jefferson Township, Balltown, Iowa, late 1890s or early 1900s
Unconformity between Carboniferous and Devonian, Montpelier, Iowa, late 1890s or early 1900s
Concretionary structure in Carboniferous near Prairie Creek, Iowa, late 1890s or early 1900s
Men by conglomerate basal with lentils of unconformity near base, Montpelier, Iowa, late 1890s or early 1900s
Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s
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