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Collection: Calvin Geological Photographs
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Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s
Favosites niagarensis, with stems of Amplexus associated with it, Monticello, Iowa, late 1890s or early 1900s
Located 6 miles southeast of Monticello.
Slab of limestone from the Middle Devonian with long winged variety of Spirifer Mucronatus con of natural size, late 1890s or early 1900s
Near Arkona. Class plate.
Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s
Pleistocene Fauna, fossil horse teeth, superior grinders of Equus scotti found in Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s
Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s
Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s
Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s
Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s
Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s
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