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Collection: Calvin Geological Photographs
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Monument of Niagaran limestone a few miles west of Keystone Mills, Iowa, late 1890s or early 1900s
Champion Quarries, Stone City, Iowa, late 1890s or early 1900s
Anamosa Stage in McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s
Lower quarry beds, Twin Springs, Iowa, late 1890s or early 1900s
Quarry with lower quarry beds of Niagaran, Farley, Iowa, late 1890s or early 1900s
Mill on the Wapsipinicon River, Littleton, Iowa, late 1890s or early 1900s
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s
Near Arkona.
Oneota River, Forreston, Iowa, late 1890s or early 1900s
Photograph taken from bridge looking up stream.
Local dip in Devonian limestone on Rapid Creek, Graham Township, Iowa, late 1890s or early 1900s
Located near center of section 20, Graham Twp.
Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, Iowa, late 1890s or early 1900s
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