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

Leaf scars of Lepidodendron, Carboniferous, 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.
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

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

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

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

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

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.

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

Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.

Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.

Located in Twp. 90, R. VI, Section 16.