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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

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

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

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

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

Illustration of the first lead mining in Dubuque, Iowa, 1850s

Illustration of the first lead mining in Dubuque, Iowa, 1850s

Brachiopods and Orthidae fossils

Brachiopods and Orthidae fossils

Block of reticulated Galena Dolomite, late 1890s or early 1900s

Block of reticulated Galena Dolomite, late 1890s or early 1900s

Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

Located near the French Creek Post Office on the upper Iowa or Oneota River. Formation is over 300 feet high.

Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s

Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s

Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s

Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s