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Collection: Calvin Geological Photographs
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Exposure of gypsum on Soldier Creek, Iowa, late 1890s or early 1900s
Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s
Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s
Located southeast of Essex.
Exposure, Eddyville, Iowa, late 1890s or early 1900s
Located one mile south of Eddyville.
Exposure, showing loess under drift, Afton Junction, 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.
Fallen masses of limestone, just above the base of Niagaran, Elk Creek, Iowa, late 1890s or early 1900s
Falling blocks in Spring Hollow in the Palisades, Mount Vernon, Iowa, late 1890s or early 1900s
Falls and rapids on roaring Jim Creek, Jamestown, Colo., late 1890s or early 1900s
Falls in Carboniferous forms on Indian Spring, Burlington, Iowa, late 1890s or early 1900s
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