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Bluff above a stream near Rawson's Mill. The thick ledge at the summit is Niagara limestone. Iowa, late 1890s or early 1900s
The height from the level of the stream to the line of contact is 94 feet.
Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s
Quarry is about 100 feet above base of bluff in Oneota.
Oneota River near Bluffton, Iowa, late 1890s or early 1900s.
Pleistocene beds with Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, Loess, Muscatine, Iowa, late 1890s or early 1900s
Pleistocene beds with Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, Loess, Muscatine, Iowa, late 1890s or early 1900s
Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s
Cold Hollow and Palisades at the entrance on the Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s
High cliff in the Upper Palisades, Cedar River, Mount Vernon, Iowa, late 1890s or early 1900s
Palisades on the right bank of the Cedar River above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s
Palisades or high cliff above Mud Hollow, Mount Vernon, Iowa, late 1890s or early 1900s
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