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Thinning of Devonian beds, Portland, 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.
Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s
Galena beds located one mile below Specht's Ferry, 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.
Weathering Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Salient ridge and cliff of Galena Limestone, Iowa, late 1890s or early 1900s
Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s
Profile of Painted Rock, Waukon Junction, 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
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