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The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s
Located south from Lattner's, near Graf.
Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.
Located in Twp. 90, R. VI, Section 16.
Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.
Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s
Group at base of bluff called "Devil's Backbone," Dundee, Iowa, late 1890s or early 1900s
Quarry east of Earlville, Iowa, late 1890s or early 1900s
Basal ledges, Washington Mills, Iowa, late 1890s or early 1900s
Elk Creek and Elk Mountain, Iowa, late 1890s or early 1900s
Topography of "Steamboat Rock" at "Devil's Backbone" region similar to that of the driftless area, Dundee, Iowa, late 1890s or early 1900s
Bealer Quarry, Cedar Valley, Iowa, late 1890s or early 1900s
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