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"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.
"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.
Block of reticulated Galena Dolomite, late 1890s or early 1900s
Block of reticulated Galena Dolomite, late 1890s or early 1900s
Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Bluff of Galena Limestone above the bridge at Bluffton, Iowa, late 1890s or early 1900s
Bluff of Galena Limestone above the bridge at Bluffton, Iowa, late 1890s or early 1900s
Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s
Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s
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