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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Crumbling granite boulder, English Township, Iowa, June 30, 1924
Located in English Twp., middle of N.W. Section 23.
Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s
Cross-bedding in Sioux Quartzite, Sioux Falls, S.D., late 1890s or early 1900s
Cross-bedding in coal measure sandstone, Red Rock, Iowa, late 1890s or early 1900s
Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s
Bellafontaine
Crew of men near lower quarry beds, east of Farley, Iowa, late 1890s or early 1900s
Cretaceous clay in drift, Coon Rapids, Iowa, late 1890s or early 1900s
Coon Rapids
Crest of redrock sandstone near west end of quarry, Red Rock, Iowa, late 1890s or early 1900s
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.
Covered with Kansan till, Osceloa Township, Iowa, late June 29, 1924
Located in Osceola Twp. in the north half of NE quarter, Section 21.
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