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Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.
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.
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.
Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, Iowa, late 1890s or early 1900s
Lower quarry beds, Twin Springs, Iowa, late 1890s or early 1900s
Anamosa Stage in McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s
Monument of Niagaran limestone a few miles west of Keystone Mills, Iowa, late 1890s or early 1900s
Left bank of Wapsipinicon River, Hale, 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
Beds of passage, Iowa, late 1890s or early 1900s
Section 10, Twp. 90 R. 4,
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