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Mass of limestone which crept down slopes over whole thickness of shales and fallen over cliff of Galena to end up 60 feet below the top of the Galena above the Little Maquoketa River, Iowa, late 1890s or early 1900s
Maquoketa River and pine covered bluffs on the west side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Left bank of Wapsipinicon River, Hale, Iowa, late 1890s or early 1900s
Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s
Monument of Niagaran limestone a few miles west of Keystone Mills, 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
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.
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