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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.
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.
Kuppinger Quarry, Mason City, Iowa, late 1890s or early 1900s

Kuppinger Quarry, Mason City, Iowa, late 1890s or early 1900s

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

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.
Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s

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

Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s

Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

Located near the French Creek Post Office on the upper Iowa or Oneota River. Formation is over 300 feet high.
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s

Block of reticulated Galena Dolomite, late 1890s or early 1900s

Block of reticulated Galena Dolomite, late 1890s or early 1900s