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Collection: Calvin Geological Photographs
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Flood waters carried boulders to where wash of hill emerges on small plain, Dorchester, Iowa, late 1890s or early 1900s
Located at Dorchester, Twp. 100, R. V. Section 13.
Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s
Folded and tilted purple limestone, Hot Springs, S. D., late 1800s or early 1900s
Folded beds of gypsum, Cascade, S.D., late 1890s or early 1800s
Folded beds of limestone, Buffalo Gap, S.D., late 1890s or early 1900s
Folded Triassic limestone, Cascade, S.D., late 1890s or early 1900s
Located near Cascade 12 miles South of Hot Springs, South Dakota.
Folding and crumpling of the Pierre Shales used by the cement company, Yankton, S.D., late 1890s or early 1900s
Folds, W. Va., late 1890s or early 1900s
Forest meets the prairie on William Brook's farm in Brookes Township, Iowa, late 1890s or early 1900s
Fossil bearing beds of Upper Devonian or Hackberry clay banks, Iowa, late 1890s or early 1900s
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