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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Cross-bedding in coal measure sandstone, Red Rock, Iowa, late 1890s or early 1900s
People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s
People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s
Moranic hills of Wisconsin Drift, Iowa, late 1890s or early 1900s
Located in the northern part of Carroll Co.
Ft. Pierre Shale, Hawarden, Iowa, late 1890s or early 1900s
Near Hawarden
Mouth of Lizard Creek, Fort Dodge, Iowa, late 1890s or early 1900s
Exposure, showing loess under drift, Afton Junction, Iowa, late 1890s or early 1900s
People with horse and cart at base of eroded surface of gypsum beds, Fort Dodge, Iowa, late 1890s or early 1900s
Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
Characteristic weathering of gypsum, Fort Dodge, Iowa, late 1890s or early 1900s
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