Concept information
Preferred term
Illinoian
Definition
- The Illinoian Stage is the name used by Quaternary geologists in North America to designate the period c.191,000 to c.130,000 years ago, during the Chibanian stage of the Pleistocene, when sediments comprising the Illinoian Glacial Lobe were deposited. It precedes the Sangamonian Stage and follows the Pre-Illinoian Stage in North America. The Illinoian Stage is defined as the period of geologic time during which the glacial tills and outwash, which comprise the bulk of the Glasford Formation, accumulated to create the Illinoian Glacial Lobe. It occurs at about the same time as the penultimate glacial period. During the Illinoian Stage, the Laurentide Ice Sheet covered about 85 percent of Illinois. At its maximum extent during this stage, this ice sheet reached its southernmost extent in North America near Carbondale, Illinois. At their maximum extent, the edge of Illinoian ice sheet(s) lay further south than the southernmost extent, i.e. Douglas County, Kansas, of any of the Pre-Illinoian ice sheets. (Adapted from: https://en.wikipedia.org/wiki/Illinoian_(stage))
Broader concept
Entry terms
- Illinoian glaciation
- Illinoian Stage
In other languages
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French
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glaciation illinoienne
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glaciation illinoïenne
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stade illinoien
URI
http://data.loterre.fr/ark:/67375/QX8-5J5ZXKBZ-S
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