Pre-Illinoian

Pre-Illinoian
~2.5 – 0.2 Ma
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Usage information
Celestial bodyEarth
Regional usageRegional
Time scale(s) usedNorth American
Definition
Chronological unitAge
Stratigraphic unitStage

The Pre-Illinoian Stage is used by Quaternary geologists for the early and middle Pleistocene glacial and interglacial periods of geologic time in North America from ~2.5–0.2 Ma (million years ago).[1]

  1. ^ Attig, John W.; Mickelson, David M. (1999). Glacial processes past and present. Boulder, Colo: The Geological Society of America, Inc. ISBN 0-8137-2337-X.