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Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s

Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s

Limestone in quarry north of Iron Bridge and Robert's Ferry near where the Interurban crosses the Iowa River, Iowa, late 1890s or early 1900s

Limestone in quarry north of Iron Bridge and Robert's Ferry near where the Interurban crosses the Iowa River, Iowa, late 1890s or early 1900s

Niagaran Lime quarry, Sugar Creek, Iowa, late 1890s or early 1900s

Niagaran Lime quarry, Sugar Creek, Iowa, late 1890s or early 1900s

Crew of men near lower quarry beds, east of Farley, Iowa, late 1890s or early 1900s

Crew of men near lower quarry beds, east of Farley, Iowa, late 1890s or early 1900s

Beds of passage, Iowa, late 1890s or early 1900s

Beds of passage, Iowa, late 1890s or early 1900s

Twp. 90. R. VI, Section 10
Beds of passage, Iowa, late 1890s or early 1900s

Beds of passage, Iowa, late 1890s or early 1900s

Section 10, Twp. 90 R. 4,
Carboniferous sandstone and shale, showing irregular bedding, Wyoming Hill, Iowa, late 1890s or early 1900s

Carboniferous sandstone and shale, showing irregular bedding, Wyoming Hill, Iowa, late 1890s or early 1900s

Quarry in Anamosa Stage of Niagaran, Le Claire, Iowa, late 1890s or early 1900s

Quarry in Anamosa Stage of Niagaran, Le Claire, Iowa, late 1890s or early 1900s

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

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

Maquoketa River and pine covered bluffs on the west side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s