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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s
American Mine, Evans, Iowa, late 1890s or early 1900s
Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s
Bellafontaine
Base of Redrock Bluff at the east end of Redrock Quarry, Iowa, late 1890s or early 1900s
Crest of redrock sandstone near west end of quarry, Red Rock, Iowa, late 1890s or early 1900s
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
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