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Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s

Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s

Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.

Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.

Devonian dolomite in quarry north of bridge, Forreston, Iowa, late 1890s or early 1900s

Devonian dolomite in quarry north of bridge, Forreston, 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

Quarry in Devonian dolomite near the Oneota River north of the bridge, Forreston, 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

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

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