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Collection: Calvin Geological Photographs
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Effects of weathering on a bluff of Trenton Limestone, Postville, Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4 north of Postville.
Effects of weathering on a bluff of limestone illustrating thin bedding, etc., Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4.
Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s
Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s
Effect of geological structure on topography, Graf, Iowa, late 1890s or early 1900s
East wall of "The Mound", north of Luverne, Minn., late 1890s or early 1900s
East ridge bordering the North Liberty Plain near Cemetery Hill, North Liberty, Iowa late 1890s or early 1900s
Located three miles north of North Liberty.
E.J.C. Bealer's Quarry, view looking down the river, Cedar Valley, Iowa, late 1890s or early 1900s
E.J.C. Bealer's Quarry, Cedar Valley, 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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