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Collection: Calvin Geological Photographs
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Cliff of Galena Limestone with lime works at the base, Eagle Point, Iowa, late 1890s or early 1900s
Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s
Willard Bacon's homestead below a Valley cut in St. Croix sandstone, Iowa, late 1890s or early 1900s
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.
Castle of Galena limestone near Catfish Creek and Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s
Located west of Dubuque.
Oneota Limestone as a building stone, Eitzen, Minn., late 1890s or early 1900s
Located near north line of Allamakee Co.
Mill on the Oneota River , Florenceville, Iowa, late 1890s or early 1900s
Picture taken from bridge at Florenceville.
Projecting block of Galena Limestone, receptaculites horizon 60 feet below top of Galena located southeast of Rockville, Iowa, late 1890s or early 1900s
North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s
Oneota Limestone near Upper Iowa or Oneota River, Iowa, late 1890s or early 1900s
Located in Twp. 99, VI, Section 21.
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