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Collection: Calvin Geological Photographs
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Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s
Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s
Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s
Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s
Rock formation in Wildcat Den State Park, Muscatine, Iowa, late 1890s or early 1900s
Cliff of Carboniferous sandstone on Pine Creek in Wild Cat Den State Park, Iowa, 1889
Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s
Quarry in Devonian dolomite near the Oneota River north of the bridge, Forreston, Iowa, late 1890s or early 1900s
Devonian dolomite in quarry north of bridge, Forreston, Iowa, late 1890s or early 1900s
Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.
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