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

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

Photo taken from the Mill.

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

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

Southwestern view.

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.

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 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 Kinderhook oolite on Des Moines River, Iowa, late 1890s or early 1900s

Cliff of Kinderhook oolite on Des Moines River, Iowa, late 1890s or early 1900s

Carboniferous clay pit, Fort Dodge, Iowa, late 1890s or early 1900s

Carboniferous clay pit, Fort Dodge, Iowa, late 1890s or early 1900s

Exposure of gypsum on Soldier Creek, Iowa, late 1890s or early 1900s

Exposure of gypsum on Soldier Creek, Iowa, late 1890s or early 1900s

Sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s

Sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s

Oblique bedding with beds dipping northeast, LeClaire, Iowa, late 1890s or early 1900s

Oblique bedding with beds dipping northeast, LeClaire, Iowa, late 1890s or early 1900s

Located one-half mile south of LeClaire.