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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.
Julien Dubuque Monument made of Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Weathered face of Galena Limestone near Walter's Furnace, Dubuque, 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.
Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Illustration of the first lead mining in Dubuque, Iowa, 1850s
Brachiopods and Orthidae fossils
Block of reticulated Galena Dolomite, 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.
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