Browse Items (154 total)

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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.

Cliff above 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.

Chicago, Milwaukee and St. Paul Railroad bridge, Fayette, Iowa, late 1890s or early 1900s

Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s

Loess and Iowan till, Windsor Township, Iowa, July 10, 1924

Located in Windsor Twp., Section 16. Looking south middle of north line of northeast 1/4.

Kansan gumbotil covered with Iowan till with background of Iowan constructional topography; Windsor Township, Iowa, July 10, 1924

View looking southeast of Section 16.

Pleistocene Fauna, molars of Elephas, 1) Elephas primigenius (Denison, Iowa) 2) Elephas columbi (West Union, Iowa), late 1890s or early 1900s

Railway cut, Oelwein, Iowa, late 1890s or early 1900s

Railway cut, Oelwein, Iowa, late 1890s or early 1900s

Railway cut showing Aftonian peat bed overlain by Kansan drift, Oelwein, Iowa, late 1890s or early 1900s

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