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Browse Items (8 total)

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Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s

Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s

Located in Twp. 96, R.V., Section 14, S.W. gr., N.W. 1/4.
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Located in Twp. 100, R. V. Sec. 34, N. E. Gr.; south side of Oneota River.
North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s

Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s

Located in Twp. 96, R.V., Section 14, S.W. gr., N.W. 1/4.
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Located in Twp. 100, R. V. Sec. 34, N. E. Gr.; south side of Oneota River.
North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

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