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The last (80 000–10 000 years ago) of four glacial episodes recognized in N. America. As with previous glacials there were several advances of the ice, and these glacial deposits include sequences of tills laid down by ice in the western N. American Cordillera. More evidence from areas peripheral to the ice sheets suggests that temperatures were perhaps 6 °C cooler than they are now. This glacial is perhaps equivalent to the Würm Glaciation or Glacial of the Alpine areas.

Subjects: Science and Mathematics.

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