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Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Located in Twp. 100, R. V. Sec. 34, N. E. Gr.; south side of Oneota River.
Yellow River cutting through Prairie du Chien Limestone, Ion, Iowa, late 1890s or early 1900s

Yellow River cutting through Prairie du Chien Limestone, Ion, Iowa, late 1890s or early 1900s

Fine quality of quarry stone with evenly bedded limestone about 40 feet above the Saint Croix, Iowa, late 1890s or early 1900s

Fine quality of quarry stone with evenly bedded limestone about 40 feet above the Saint Croix, Iowa, late 1890s or early 1900s

Located in Twp. 100, R. V. Section 18, N. W. 1/4, N. E. corner.
Mineral Creek valley cut in Oneota limestone, Iowa, late 1890s or early 1900s

Mineral Creek valley cut in Oneota limestone, Iowa, late 1890s or early 1900s

Located in Twp. 99, R. VI, Section 14.
Small spring in Trenton Limestone, west of Devil's Den, Iowa, late 1890s or early 1900s

Small spring in Trenton Limestone, west of Devil's Den, Iowa, late 1890s or early 1900s

Hill above New Albin, Minn., late 1890s or early 1900s

Hill above New Albin, Minn., late 1890s or early 1900s

Picture taken from Iron Monument marking boundary between Iowa and Minnesota.
Summit of Table Mound in driftless area, Dubuque, Iowa, late 1890s or early 1900s

Summit of Table Mound in driftless area, Dubuque, Iowa, late 1890s or early 1900s

Iron mine, Waukon, Iowa, late 1890s or early 1900s

Iron mine, Waukon, Iowa, late 1890s or early 1900s

Located at Waukon, Northeast of, Twp. 99, R. VI, Section 36, N. W. gr., S. E. 1/4
Waukon Sphinx left by unequal weathering, Waukon, Iowa, late 1890s or early 1900s

Waukon Sphinx left by unequal weathering, Waukon, Iowa, late 1890s or early 1900s

Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s

Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s