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Collection: Calvin Geological Photographs
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Masses in situ on plain underlain by Buchanan gravels, Manchester, Iowa, late 1890s or early 1900s
Thin bedding with dip northeast. Heavy beds at base of section containing Dinobolus conradi Hall and many casts of small individuals of Atrypa reticularis, Linne, Iowa, late 1890s or early 1900s
Thin bedded and the heavy beds at base of section contain Dinobolus conradi Hall and numerous casts of Atrypa reticularis, Linne, Iowa, late 1890s or early 1900s
Lime quarry, Cedar Valley, Iowa, late 1890s or early 1900s
Lime quarry, Cedar Valley, Iowa, late 1890s or early 1900s
Anamosa Stage, Cedar Bluff, Iowa, late 1890s or early 1900s
Blocks from basal ledges, creeping down slopes of Maquoketa Shales, Epworth, Iowa, late 1890s or early 1900s
Located north of Epworth.
Monadnock east of Almoral, Iowa, late 1890s or early 1900s
Fallen masses of limestone, just above the base of Niagaran, Elk Creek, Iowa, late 1890s or early 1900s
Devil's Backbone in a small driftless area, Dundee, Iowa, late 1890s or early 1900s
Located northwestern part of Delaware County, Iowa.
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