Pre-Illinoian

（重定向自Aftonian interglacial）

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 ~2.5–0.5 Ma (million years ago), a period of ~2 million years.

单词	Aftonian interglacial
释义	Aftonian interglacial 英语百科 Pre-Illinoian （重定向自Aftonian interglacial） 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 ~2.5–0.5 Ma (million years ago), a period of ~2 million years.
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