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Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Cliff of Carboniferous sandstone on Pine Creek in Wild Cat Den State Park, Iowa, 1889

Cliff of Carboniferous sandstone on Pine Creek in Wild Cat Den State Park, Iowa, 1889

Rock formation in Wildcat Den State Park, Muscatine, Iowa, late 1890s or early 1900s

Rock formation in Wildcat Den State Park, Muscatine, Iowa, late 1890s or early 1900s

Exposure, Eddyville, Iowa, late 1890s or early 1900s

Exposure, Eddyville, Iowa, late 1890s or early 1900s

Located one mile south of Eddyville.

Leaf scars of Lepidodendron, Carboniferous, 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

Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s

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

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

Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s

Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s

Ravine, Winterset, Iowa, late 1890s or early 1900s

Ravine, Winterset, Iowa, late 1890s or early 1900s

Located southwest of Winterset.