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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.

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

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

Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s

Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s

Effect of geological structure on topography, Graf, Iowa, late 1890s or early 1900s

Effect of geological structure on topography, Graf, Iowa, late 1890s or early 1900s

Castles of limestone in driftless area near line of Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s

Castles of limestone in driftless area near line of Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s

Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s

Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s

Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s

Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s

Willard Bacon's homestead below a Valley cut in St. Croix sandstone, Iowa, late 1890s or early 1900s

Willard Bacon's homestead below a Valley cut in St. Croix sandstone, Iowa, late 1890s or early 1900s

Flood waters carried boulders to where wash of hill emerges on small plain, Dorchester, Iowa, late 1890s or early 1900s

Flood waters carried boulders to where wash of hill emerges on small plain, Dorchester, Iowa, late 1890s or early 1900s

Located at Dorchester, Twp. 100, R. V. Section 13.

Castle of Galena limestone near Catfish Creek and Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s

Castle of Galena limestone near Catfish Creek and Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s

Located west of Dubuque.