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Peat and forest bed of Sangamon, interglacial interval, underlain by Illinoian Drift, overlain by Iowan loess and Wisconsin Drift east of Peoria, Ill., late 1890s or early 1900s

Peat and forest bed of Sangamon, interglacial interval, underlain by Illinoian Drift, overlain by Iowan loess and Wisconsin Drift east of Peoria, Ill., late 1890s or early 1900s

Section of drift deposits west of Muscatine, Iowa, late 1890s or early 1900s

Section of drift deposits west of Muscatine, Iowa, late 1890s or early 1900s

Boulder field, Newton Township, Iowa, late 1890s or early 1900s

Boulder field, Newton Township, Iowa, late 1890s or early 1900s

Cedar River from top of Old McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s

Cedar River from top of Old McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s

Man by Illinoian Drift between two igneous deposits, Muscatine, Iowa, late 1890s or early 1900s

Man by Illinoian Drift between two igneous deposits, Muscatine, Iowa, late 1890s or early 1900s

Abandoned channel of Lime Creek, Mason City, Iowa, late 1890s or early 1900s

Abandoned channel of Lime Creek, Mason City, Iowa, late 1890s or early 1900s

Buchanan gravels, Winthrop, Iowa, late 1890s or early 1900s

Buchanan gravels, Winthrop, Iowa, late 1890s or early 1900s

Iowa River as a characteristic stream of the drift covered area, Old Capital Quarries, Iowa, late 1890s or early 1900s

Iowa River as a characteristic stream of the drift covered area, Old Capital Quarries, Iowa, late 1890s or early 1900s

Lake Minnewashta south of Spirit Lake, Iowa, late 1890s or early 1900s

Lake Minnewashta south of Spirit Lake, Iowa, late 1890s or early 1900s

Lake Minnewashta south of Spirit Lake, Iowa, late 1890s or early 1900s

Lake Minnewashta south of Spirit Lake, Iowa, late 1890s or early 1900s