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Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Castle of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Located west of Durango.
Wall of Galena Limestone west of Durango, Iowa, late 1890s or early 1900s
Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s
Located N.E.S.E. 16, Twp. 96, 4.
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
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