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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
Located in Twp. 100, R. V. Sec. 34, N. E. Gr.; south side of Oneota River.
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
Located in Twp. 99, R. VI, Section 14.
Small spring in Trenton Limestone, west of Devil's Den, 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.
Bluffs in driftless area showing characteristic distribution of timber sharply limited to northern and northeastern slopes, Iowa, late 1890s or early 1900s
Located in Twp. 100, R.V.section 15.
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.
Effects of weathering on a bluff of limestone illustrating thin bedding, etc., Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4.
Driftless area looking down into Iowa River gorge, Iowa, late 1890s or early 1900s
Man standing at top of waterfall in Devil's Den, Iowa, late 1890's or early 1900s
"Devil's Den" located at Twp. 99, R. V, Section 19, N.W. gr., N.E. 1/4, N.E. corner.
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