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Collection: Calvin Geological Photographs
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Company house at base of Porphyry Mountain, Colorado, late 1890s or early 1900s
Columns of St. Croix sandstone, Iowa, late 1890s or early 1900s
Located on Lane's Farm, Twp. 100, NR. IV, Section 31, N.W. gr., N.W. 1/4.
Cold Hollow and Palisades at the entrance on the Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s
Coal Measure Shale, Fort Dodge, 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.
Coal Measure Sandstone on Raccoon River, Iowa, late 1890s or early 1900s
Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s
Coal at Richardson's Mine, Iowa, late 1890s or early 1900s
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.
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s
Photograph taken from Mill.
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