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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Cliff of Niobrara chalk on Cheyenne River east of Fall River, Hot Springs, S.D., late 1890s or early 1900s
Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Trenton Limestone on the Oneota River, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s
Bluffton, above; top of bluff at Cold Spring
Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
Cliffs above the mill, Clay Mill, Iowa, late 1890s or early 1900s
Cliffs of Galena Limestone on Oneota River, Bluffton, Iowa, late 1890s or early 1900s
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s
Photo taken from the Mill.
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s
Photograph taken from Mill.
Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.
Located 1/4 mile south of Black Springs.
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