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Driftless area showing effects of geological structure on topography, steep escarpment is Niagara Limestone, lower gentler slopes occupied with Maquoketa Shales, Lattners, Iowa, late 1890s or early 1900s
Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s
Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s
Located at Twp. 96, R. W. Section 32, N. W. gr., N. W. 1/4.
Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s
Mouth of cave at Devil's Den, Iowa, late 1890s or early 1900s
Located in Twp. 99 R. 5 Section 19 N. W. gr., N. E, 1/4, N. E. corner.
Mount Hope, Union City Township, Iowa, late 1890s or early 1900s
Located north east 34, 100, 5.
Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s
Waukon Sphinx left by unequal weathering, 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
Hill above New Albin, Minn., late 1890s or early 1900s
Picture taken from Iron Monument marking boundary between Iowa and Minnesota.
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