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Cliff of Niobrara chalk on Cheyenne River east of Fall River, Hot Springs, S.D., late 1890s or early 1900s

Cliff of Niobrara chalk on Cheyenne River east of Fall River, Hot Springs, S.D., late 1890s or early 1900s

Cliff of Niobrara chalk on Cheyenne River east of Fall River, Hot Springs, S.D., late 1890s or early 1900s

Cliff of Niobrara chalk on Cheyenne River east of Fall River, Hot Springs, S.D., late 1890s or early 1900s

Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone on the Oneota River, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone on the Oneota River, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone on the Oneota River, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone on the Oneota River, 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

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

Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s

Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s

Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s

Cliff of Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s