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Collection: Calvin Geological Photographs
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Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s
Located at Twp. 96, R. W. Section 32, N. W. gr., N. W. 1/4.
Cedar Valley Stage limestone with lentincular masses included between the strata, Iowa City, Iowa, late 1890s or early 1900s
Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s
Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s
Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s
Located in Twp. 81, R. VII, Section 22
Bluffs in driftless area showing characteristic distribution of timber sharply limited to northern and northeastern slopes, Iowa, late 1890s or early 1900s
Located in Twp. 100, R.V.section 15.
Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s
Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Clay pit of Mason City Brick and Tile Company, Mason City, Iowa, late 1890s or early 1900s
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