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Browse Items (130 total)

Gorge at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge at Pinney's Spring, Iowa, late 1890s or early 1900s

Bluff, Iowa, late 1890s or early 1900s

Bluff, Iowa, late 1890s or early 1900s

Located in Twp., 100, R.W. Section 14, N.W. gr., S. 1/2.
Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s

Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s

Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Located in the R.W. Section 16, S.W. gr., N.E. 1/4.
Bluff on Upper Iowa River (formerly Oneota River), Saint Croix capped by Oneota, height 300 ft. plus, Iowa, late 1890s or early 1900s

Bluff on Upper Iowa River (formerly Oneota River), Saint Croix capped by Oneota, height 300 ft. plus, Iowa, late 1890s or early 1900s

Bear Creek, near the south of Allamakee Co.
Oneota valley from the south and peneplain, Iowa, late 1890s or early 1900s

Oneota valley from the south and peneplain, Iowa, late 1890s or early 1900s

Located in Twp. 99, R. VI, Section 36, N.W. gr., S.E. 1/4 in northeast Iowa.
Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Located in Twp. 95, R.V. Section 34, S.W. gr., N.W. 1/4.
Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s

Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s

Quarry is about 100 feet above base of bluff in Oneota.
Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Located in Twp. 99, R.V. Section I, N.W. gr.
Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Located in Twp. 95, R.V. Section 34, S.W. gr. N.W. 1/4.