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Collection: Calvin Geological Photographs
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Wide portion of the Iowa River Valley as seen from the north valley wall above the Upper Interuban Bridge, Iowa, late 1890s or early 1900s
Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.
Located 1/4 mile south of Black Springs.
Section (2) of Buchanan Gravels folded and contorted by the Iowan Ice Sheet in the first Interurban cut, Iowa, late 1890s or early 1900s
Located north of the upper Interurban bridge.
Topographic map of the Fairfax quadrangle, Iowa, late 1890s or early 1900s
North wall of Iowa River valley, west of Helman sand pit, showing terrace-like feature, Iowa City, Iowa, late 1890s or early 1900s
Kansan Loess topography near Kansan-Iowan border, Oakdale, Iowa, late 1890s or early 1900s
North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s
North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s
Hills of Kansan drift, Belle Plaine, Iowa, late 1890s or early 1900s
Hill in Webster County, Iowa, late 1890s or early 1900s
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