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Buchanan gravels, horizontal view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels, horizontal view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels with boulders of Iowan stage, Illinois Central Gravel Pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels with boulders of Iowan stage, Illinois Central Gravel Pit, Independence, Iowa, late 1890s or early 1900s

The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s

The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s

Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Heaving of ice along margin of Clear Lake, Iowa, late 1890s or early 1900s

Heaving of ice along margin of Clear Lake, Iowa, late 1890s or early 1900s

Glacial markings, Burlington, Iowa, late 1890s or early 1900s

Glacial markings, Burlington, Iowa, late 1890s or early 1900s

Buchanan Gravels, Earlville, Iowa, late 1890s or early 1900s

Buchanan Gravels, Earlville, Iowa, late 1890s or early 1900s

Sand Pit at the upper Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Sand Pit at the upper Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Beds, Peoria, Ill., late 1890s or early 1900s

Beds, Peoria, Ill., late 1890s or early 1900s

Located east of Peoria, Ill.

Boulders from the marginal moraine of the Wisconsin Drift Sheet, Clear Lake, Iowa, late 1890s or early 1900s

Boulders from the marginal moraine of the Wisconsin Drift Sheet, Clear Lake, Iowa, late 1890s or early 1900s