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Collection: Calvin Geological Photographs
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Men by conglomerate basal with lentils of unconformity near base, Montpelier, Iowa, late 1890s or early 1900s
Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s
Falls in Carboniferous forms on Indian Spring, Burlington, Iowa, late 1890s or early 1900s
Jointed structure in Carboniferous sandstone, Montpelier, Iowa, late 1890s or early 1900s
Carboniferous outlier, Iowa City, Iowa, late 1890s or early 1900s
Cavern in Carboniferous sandstone, Wild Cat Den State Park, Iowa, late 1890s or early 1900s
Outlier of Carboniferous sandstone, Iowa City, Iowa, late 1890s or early 1900s
Coal Measure Shale, Fort Dodge, Iowa, late 1890s or early 1900s
Carboniferous sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s
Carboniferous shale, Mena, Ark., late 1890s or early 1900s
Located east of Mena, Arkansas.
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