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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Falling blocks in Spring Hollow in the Palisades, Mount Vernon, Iowa, late 1890s or early 1900s
Fallen masses of limestone, just above the base of Niagaran, Elk Creek, Iowa, late 1890s or early 1900s
Fall River falls showing Dakota sandstone at a point where the highly inclined beds pass beneath the softer Benton shales, Hot Springs, S.D., late 1890s or early 1900s
Located 4 miles East of Hot Springs, South Dakota.
Exposure, showing loess under drift, Afton Junction, Iowa, late 1890s or early 1900s
Exposure, Eddyville, Iowa, late 1890s or early 1900s
Located one mile south of Eddyville.
Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s
Located southeast of Essex.
Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s
Exposure of gypsum on Soldier Creek, Iowa, late 1890s or early 1900s
Exposure of Devonian on Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1800s
Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s
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