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Castle of Galena limestone, Durango, 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

Wall of Galena Limestone west of Durango, Iowa, late 1890s or early 1900s

Kuppinger Quarry, Mason City, 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

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

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

City Quarry, Independence, Iowa, late 1890s or early 1900s

Thinning of Devonian beds, Portland, 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

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

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

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