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Geology of Iowa Iowa's bedrock geology generally increases in age from west to east. In northwest Iowa Cretaceous bedrock can be 74 million years old, in eastern Iowa Cambrian bedrock dates to ca. 500 million years ago. Iowa is generally not flat; most of the state consists of rolling hills. Prior divides Iowa into eight landforms based on glaciation, soils, topography, and river drainage. Loess hills lie along the western border of the state, some of which are several hundred feet thick. In the northeast, along the Mississippi River, is a section of the Driftless Zone, which in Iowa consists of steep hills and valleys which appear almost mountainous. There are several natural lakes in the state, most notably Spirit Lake, West Okoboji Lake, and East Okoboji Lake in northwest Iowa (see Iowa Great Lakes). To the east lies Clear Lake. Man-made lakes include Lake Odessa, Saylorville Lake, Lake Red Rock, Coralville Lake, Lake MacBride, and Rathbun Lake. The northwest part of the state also contains a considerable number of remnants of the once common wetland areas such as Barringer Slough. http://creativecommons.org/licenses/by-sa/3.0/ |
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