Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (748 total) for Calvin Geological Photographs

Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s

Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s

Bluffs in driftless area showing characteristic distribution of timber sharply limited to northern and northeastern slopes, Iowa, late 1890s or early 1900s

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.
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, 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
Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s

Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s

Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s

Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s

Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s

Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s

Cedar Valley Stage limestone with lentincular masses included between the strata, Iowa City, Iowa, late 1890s or early 1900s

Cedar Valley Stage limestone with lentincular masses included between the strata, Iowa City, Iowa, late 1890s or early 1900s

Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s

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.
Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s

Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s

Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s

Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s

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