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Bølling oscillation : ウィキペディア英語版
Bølling oscillation
The Bølling oscillation, also Bølling interstadial,〔Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, 1984, p. 67. ISBN 0-14-051094-X.〕 was a warm interstadial period between the Oldest Dryas and Older Dryas stadials, at the end of the last glacial period. It is named after a peat sequence discovered at Bølling lake, central Jutland. It is used to describe a period of time in relation to Pollen zone Ib—in regions where the Older Dryas is not detected in climatological evidence, the Bølling-Allerød is considered a single interstadial period.
==Dates==
The beginning of the Bølling is also the high-resolution date for the sharp temperature rise marking the end of the Oldest Dryas at 14,670 BP. Roberts (1998) uses 15,000. A range of 14,650-14,000 BP calibrated has been assigned to the Bølling layer of the excavation at Lake Neuchâtel, Switzerland, 1992-1993. The Oxygen isotope record from Greenland ice includes the Bølling warm peak between 14,600 and 14,100 BP. Most of the recent dates available fall within a few hundred years of these.

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