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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Kuppinger Quarry, Mason City, Iowa, late 1890s or early 1900s
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
Driftless area looking down into Iowa River gorge, 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
Block of reticulated Galena Dolomite, late 1890s or early 1900s
Brachiopods and Orthidae fossils
Illustration of the first lead mining in Dubuque, Iowa, 1850s
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