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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.
Cascade in winter, Burlington, Iowa, late 1890s or early 1900s
Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s
Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, Iowa, late 1890s or early 1900s
Local dip in Devonian limestone on Rapid Creek, Graham Township, Iowa, late 1890s or early 1900s
Located near center of section 20, Graham Twp.
Oneota River, Forreston, Iowa, late 1890s or early 1900s
Photograph taken from bridge looking up stream.
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s
Near Arkona.
Mill on the Wapsipinicon River, Littleton, Iowa, late 1890s or early 1900s
Quarry with lower quarry beds of Niagaran, Farley, Iowa, late 1890s or early 1900s
Lower quarry beds, Twin Springs, Iowa, late 1890s or early 1900s
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