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Collection: Calvin Geological Photographs
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Oneota River, Forreston, Iowa, late 1890s or early 1900s
Photograph taken from bridge looking up stream.
Oneota valley from the south and peneplain, Iowa, late 1890s or early 1900s
Located in Twp. 99, R. VI, Section 36, N.W. gr., S.E. 1/4 in northeast Iowa.
Open pit mine, Iowa, late 1890s or early 1900s
Opposite points where the road enters the valley on the west side of "Backbone," Iowa, late 1890s or early 1900s
Outcropping, Winterset, Iowa, late 1890s or early 1900s
Located along the road south from Winterset.
Outlier of Carboniferous sandstone, Iowa City, Iowa, late 1890s or early 1900s
Outlier of Niagaran limestone in Williams Quarry, Clermont, Iowa, late 1890s or early 1900s
Overland hill, Iowa, late 1890s or early 1900s
Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s
Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s
Located in Twp. 99, R.V. Section I, N.W. gr.
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