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Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s

Cliff of Trenton Limestone, crowned with pines, Cold Water Spring Preserve, Bluffton, Iowa, late 1890s or early 1900s

Bluffton, above; top of bluff at Cold Spring

Profile of Painted Rock, Waukon Junction, Iowa, late 1890s or early 1900s

Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s

Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s

Salient ridge and cliff of Galena Limestone, Iowa, late 1890s or early 1900s

Salient ridge and cliff of Galena Limestone, Iowa, late 1890s or early 1900s

Weathering Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s

Weathering Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s

Effects of weathering on a bluff of limestone illustrating thin bedding, etc., Iowa, late 1890s or early 1900s

Effects of weathering on a bluff of limestone illustrating thin bedding, etc., Iowa, late 1890s or early 1900s

Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4.

Galena beds located one mile below Specht's Ferry, Iowa, late 1890s or early 1900s

Galena beds located one mile below Specht's Ferry, Iowa, late 1890s or early 1900s

Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s

Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s

Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s

Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s

Fourth bluff below.

Thinning of Devonian beds, Portland, Iowa, late 1890s or early 1900s

Thinning of Devonian beds, Portland, Iowa, late 1890s or early 1900s