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Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Cliff of Carboniferous sandstone in Wild Cat Den State Park, Iowa, late 1890s or early 1900s

Cliff of Carboniferous sandstone in Wild Cat Den State Park, Iowa, late 1890s or early 1900s

Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s

Exposure of Upper Coal Measures, Essex, Iowa, late 1890s or early 1900s

Located southeast of Essex.
Pekay Mine, Pekay, Iowa, late 1890s or early 1900s

Pekay Mine, Pekay, Iowa, late 1890s or early 1900s

Southwestern view.
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s

Cliffs, Clay Mill, Iowa, late 1890s or early 1900s

Photo taken from the Mill.
Champion Quarry, Stone City, Iowa, October 19, 1895

Champion Quarry, Stone City, Iowa, October 19, 1895

J. A. Green
Man standing near oblique bedding at Sugar Creek lime quarries, Sugar Creek, Iowa, late 1890s or early 1900s

Man standing near oblique bedding at Sugar Creek lime quarries, Sugar Creek, Iowa, late 1890s or early 1900s

Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s

Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s

Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s

Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s

Topography of "Steamboat Rock" at "Devil's Backbone" region similar to that of the driftless area, Dundee, Iowa, late 1890s or early 1900s

Topography of "Steamboat Rock" at "Devil's Backbone" region similar to that of the driftless area, Dundee, Iowa, late 1890s or early 1900s