Thanks to the Glaciers

Dr. Edward Runge>LPL Interviews N-Z>LPL Interviews K-Z, Segment 6

Thanks to the Glaciers,

duration 01:24

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Discussion of Illinois soils. Soils of central Illinois are dark, either thick layer of loess or thin loess over Wisconsin glacial till. Latter shows a moraine in Shelbyville that marks the edge. Loess cap is about four feet deep. Gray southern soils are weathered pre-Wisconsin surface, north soils on calcium carbonate bed. Soils on acid substrate weather faster and lose fertility. Time is 20,000 years ago.