Younger Dryas Cooling

One of the more notable periods of cooling is known as the Younger Dryas Cooling. This period occurred 10,000 to 11,000 years ago, which coincides with the geologic boundary of the Pleistocene and Holocene epochs. Glacial ice advanced from the north and moved southward to about 45°N latitude (roughly the same latitude as Minneapolis, Minnesota, and Portland, Oregon). This was a significant advance, because ice levels proceeded within about 10° of where they had reached during the last glacial maximum.

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