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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s
Located southeast of Essex.
Cliff of Carboniferous sandstone in Wild Cat Den State Park, Iowa, late 1890s or early 1900s
Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s
Cliff of Kinderhook oolite on Des Moines River, Iowa, late 1890s or early 1900s
Carboniferous clay pit, Fort Dodge, Iowa, late 1890s or early 1900s
Exposure of gypsum on Soldier Creek, Iowa, late 1890s or early 1900s
Sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s
Oblique bedding with beds dipping northeast, LeClaire, Iowa, late 1890s or early 1900s
Located one-half mile south of LeClaire.
Oblique bedding at Sugar Creek lime quarries, Sugar Creek, Iowa, late 1890s or early 1900s
Man standing by oblique bedding in Sugar Creek lime quarries, Sugar Creek, Iowa, late 1890s or early 1900s
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