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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Concretionary structure in Carboniferous near Prairie Creek, Iowa, late 1890s or early 1900s
Conglomerate near the "Plunge", Hot Springs, South Dakota, late 1890s or early 1900s
Consideration Mine No. 8, Given, Iowa, late 1890s or early 1900s
Contact of Carboniferous with Devonian showing unconformity, Iowa City, Iowa, late 1890s or early 1900s
Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s
Corals, Heliophyllum. Plate 2., late 1890s or early 1900s
Core of till, mantled with loess, looking south across Anamosa, Wyoming Road, Anamosa, Iowa, July 8, 1924
Located just South of Jackson Twp., Section 24 (Primary 6).
Court House on the Sioux River, Sioux Falls, S.D., late 1890s or early 1900s
Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924
Located in Osceola Twp. in the north half of NE quarter, Section 21.
Cracked gumbotil and contact with loess above, Iowa, July 25, 1924
Located in Monroe and 1 Athens Twp., middle of east half of line between Sections 36.