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Collection: Calvin Geological Photographs
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Man standing in cut for the foundation of women's gymnasium shows Loess overlying Buchanan Gravels, The University of Iowa, late 1890s or early 1900s
Quartzite concretions in Redrock Sandstone, Iowa, late 1890s or early 1900s
Consideration Mine No. 8, Given, Iowa, late 1890s or early 1900s
Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
New workings in quarry in Upper Coal Measures, Earlham, Iowa, late 1890s or early 1900s
Quarry in Upper Coal Measures, old workings showing separation of stone into ledges, Earlham, Iowa, late 1890s or early 1900s
Roberson's brick yard, Des Moines, Iowa, late 1890s or early 1900s
Kilns and sheds of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s
Elk Cliff with Coal Measure Sandstone on Des Moines River, Rosseau, Iowa, late 1890s or early 1900s
Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.
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