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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
Kuppinger Quarry, Mason City, Iowa, late 1890s or early 1900s
Iron bridge with piers of Devonian Limestone, North Liberty, Iowa, late 1890s or early 1900s
Located northwest of North Liberty.
Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s
Located N.E.S.E. 16, Twp. 96, 4.
City Quarry, Independence, Iowa, late 1890s or early 1900s
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
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6301
6302
6303
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6313
6314
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6320
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