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Additional
Pre-Illinoian
English Wikipedia - The Free Encyclopedia
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Pre-Illinoian
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 ~.
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