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Collection: Calvin Geological Photographs
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Undrained basin in Iowan Drift plain area of topographic youth near Swan Lake and surroundings, Madison Township, Iowa, late 1890s or early 1900s
Undercutting of Gower limestone on Wapsipinicon River, Massillon, Iowa, late 1890s or early 1900s
Unconformity between Carboniferous and Devonian, Montpelier, Iowa, late 1890s or early 1900s
Typical landscape in region covered with deep loess, near border of Iowan Drifts, Graham Township, Iowa, late 1890s or early 1900s
Typical Kansan topography, Tipton, Iowa, late 1890s or early 1900s
Typical development of coal measures shale in the coal pit of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s
Geological Survey
Two tills and two loesses, Iowa, June 18, 1925
Located in the west of corner of sections 20, 21, 28, and 29.
Topography of Iowan Drift area, Massilon Township, Iowa, July 18, 1925
Located in Massilon Twp., sections 29 and 32.
Topography of "Steamboat Rock" at "Devil's Backbone" region similar to that of the driftless area, Dundee, Iowa, late 1890s or early 1900s
Topographies of the typical Iowa Drift Plain and the dissected Kansan Drift Plain, west of Washington near Van Horne, Iowa, late 1890s or early 1900s
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