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Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s
Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s
Fourth bluff below.
Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s
Located N.E.S.E. 16, Twp. 96, 4.
Wall of Galena Limestone west of Durango, Iowa, late 1890s or early 1900s
Castle of Galena limestone, Durango, Iowa, late 1890s or early 1900s
Located west of Durango.
Quarry in Galena Limestone, Dubuque, 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.
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s
Maquoketa shales, Graf, 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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