Pre-Illinoian

Pre-Illinoian

Jesse Russell Ronald Cohn

     

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ISBN: 978-5-5120-8274-4

High Quality Content by WIKIPEDIA articles! The Pre-Illinoian Stage is often synonymous with Pre-Illinoian glacial and used by Quaternary geologists for the early and middle Pleistocene glacial and interglacial periods of geologic time in North America from ~2.5 Ma—500,000 years ago, a period of ~2 million years.

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