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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

Characteristic weathering of gypsum, Fort Dodge, Iowa, late 1890s or early 1900s

Characteristic weathering of gypsum, Fort Dodge, Iowa, late 1890s or early 1900s

Bridge over Sioux River and Sioux Quartzite ledges, Dell Rapids, South Dakota, late 1890s or early 1900s

Bridge over Sioux River and Sioux Quartzite ledges, Dell Rapids, South Dakota, late 1890s or early 1900s

Bridge over Sioux River, Dell Rapids, South Dakota
"The Dells" canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s

"The Dells" canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Bluffs of Kettle Creek, Millersville, Iowa, late 1890s or early 1900s

Bluffs of Kettle Creek, Millersville, Iowa, late 1890s or early 1900s

Located below Millersville.
Diabase ledge and riffle in Split Rock Creek, Ristie's Farm, Corson, S.D., late 1890s or early 1900s

Diabase ledge and riffle in Split Rock Creek, Ristie's Farm, Corson, S.D., late 1890s or early 1900s

Canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s

Canyon in Sioux Quartzite, Dell Rapids, South Dakota, late 1890s or early 1900s

Sandstone interbedded with shale from Des Moines Stage at Currier's Mill, Oskaloosa, Iowa, late 1890s or early 1900s

Sandstone interbedded with shale from Des Moines Stage at Currier's Mill, Oskaloosa, Iowa, late 1890s or early 1900s

Goldthorpe's Zinc Mine, Durango, Iowa, late 1890s or early 1900s

Goldthorpe's Zinc Mine, Durango, Iowa, late 1890s or early 1900s