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Maquoketa shales, Graf, Iowa, late 1890s or early 1900s

Maquoketa shales, Graf, Iowa, late 1890s or early 1900s

Old Capitol Quarry, Iowa City, Iowa, late 1890s or early 1900s

Old Capitol Quarry, Iowa City, Iowa, late 1890s or early 1900s

Contact of Carboniferous with Devonian showing unconformity, Iowa City, Iowa, late 1890s or early 1900s

Contact of Carboniferous with Devonian showing unconformity, Iowa City, Iowa, late 1890s or early 1900s

Pine Creek, Iowa, late 1890s or early 1900s

Pine Creek, Iowa, late 1890s or early 1900s

Oneota River and bluff of Devonian dolomite, above bridge at Forreston, Iowa, late 1890s or early 1900s

Oneota River and bluff of Devonian dolomite, above bridge at Forreston, Iowa, late 1890s or early 1900s

Fishermen in gorge of Oneota River gorge cut in Devonian limestone, Forreston, Iowa, late 1890s or early 1900s

Fishermen in gorge of Oneota River gorge cut in Devonian limestone, Forreston, Iowa, late 1890s or early 1900s

Hutchinson's Quarry, Iowa City, Iowa, late 1890s or early 1900s

Hutchinson's Quarry, Iowa City, Iowa, late 1890s or early 1900s

Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s

Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s

Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s

Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s

Limestone in quarry north of Iron Bridge and Robert's Ferry near where the Interurban crosses the Iowa River, Iowa, late 1890s or early 1900s

Limestone in quarry north of Iron Bridge and Robert's Ferry near where the Interurban crosses the Iowa River, Iowa, late 1890s or early 1900s