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Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s

Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s

Located at Twp. 96, R. W. Section 32, N. W. gr., N. W. 1/4.

Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s

Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s

Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s

Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s

Cliff of Galena limestone, Durango, Iowa, late 1890s or early 1900s

Cliff of Galena limestone, Durango, Iowa, late 1890s or early 1900s

Cliffs of Galena Limestone on Oneota River, Bluffton, Iowa, late 1890s or early 1900s

Cliffs of Galena Limestone on Oneota River, Bluffton, Iowa, late 1890s or early 1900s

Bluff, Waukon Junction, Iowa, late 1890s or early 1900s

Bluff, Waukon Junction, Iowa, late 1890s or early 1900s

Bluff of Galena Limestone above the bridge at Bluffton, Iowa, late 1890s or early 1900s

Bluff of Galena Limestone above the bridge at Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s

Bluffton, above; top of bluff at Cold Spring

Profile of Painted Rock, Waukon Junction, Iowa, late 1890s or early 1900s

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

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