Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (88 total)

Monadnock east of Almoral, Iowa, late 1890s or early 1900s

Monadnock east of Almoral, Iowa, late 1890s or early 1900s

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

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.
"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, late 1890s or early 1900s

Located near the French Creek Post Office on the upper Iowa or Oneota River. Formation is over 300 feet high.
Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s

Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s

Fourth bluff below.
Hill above New Albin, Minn., late 1890s or early 1900s

Hill above New Albin, Minn., late 1890s or early 1900s

Picture taken from Iron Monument marking boundary between Iowa and Minnesota.
Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Hill formed by circumdenudation with base of leveled plain composed of St. Croix overlain by Oneota limestone, Iowa, late 1890s or early 1900s

Located in Twp. 100, R. V. Sec. 34, N. E. Gr.; south side of Oneota River.
Oneota Limestone near Upper Iowa or Oneota River, Iowa, late 1890s or early 1900s

Oneota Limestone near Upper Iowa or Oneota River, Iowa, late 1890s or early 1900s

Located in Twp. 99, VI, Section 21.
Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s

Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s

Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Located in Twp. 99, R.V. Section I, N.W. gr.
Field class near West Hill section, Muscatine, Iowa, June 1910

Field class near West Hill section, Muscatine, Iowa, June 1910

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