North American Pleistocene Stages Reconsidered in Light of Probable Pliocene-Pleistocene Continental Glaciation

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Science  20 Oct 1978:
Vol. 202, Issue 4365, pp. 305-307
DOI: 10.1126/science.202.4365.305


Confusion due to the conceptual usage of classic North American Pleistocene stage terms indicates the need for a new or revised terminology. The Pliocene-Pleistocene boundary has tentatively been dated about 2.5 ± 0.1 x 106 years. Glacial deposits in the central United States older than about 2.2 x 106 years may span that boundary.