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Collection: Calvin Geological Photographs
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Geological chart of Iowa in Geological Lecture room, Old Science Hall, The University of Iowa, December 13, 1899
Gateway to the Garden of the Gods, Colorado Springs, Colo., late 1890s or early 1900s
Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s
Galena Limestone at level of "Cap Rock", Dubuque, Iowa, late 1890s or early 1900s
Galena Limestone and St. Peter Sandstone, Specht's Ferry, Iowa, late 1890s or early 1900s
Galena beds located one mile below Specht's Ferry, Iowa, late 1890s or early 1900s
Ft. Pierre Shale, Hawarden, Iowa, late 1890s or early 1900s
Near Hawarden
Frank Leverett, George F. Kay, and Paul MacClintock in the field, Lime Springs, Iowa, July 4, 1925
Fossil bearing beds of Upper Devonian or Hackberry clay banks, Iowa, late 1890s or early 1900s
Forest meets the prairie on William Brook's farm in Brookes Township, Iowa, late 1890s or early 1900s
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