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Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s
Effects of weathering on a bluff of Trenton Limestone, Postville, Iowa, late 1890s or early 1900s
Located in Twp. 96, R. VI, Section 17, S.E. gr., S.E. 1/4 north of Postville.
Bluffs on Upper Iowa or Oneota River, Decorah, Iowa, late 1890s or early 1900s
Rocks in the valley of the Yellow River, Iowa, late 1890s or early 1900s
Located in Twp. 96, R.V., Section 14, S.W. gr., N.W. 1/4.
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.
Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s
"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s
Located near the French Creek Post Office on the upper Iowa or Oneota River. Formation is over 300 feet high.
Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Castle of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Located west of Durango.
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