Allerød oscillation
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Allerød | |
---|---|
Usage information | |
Celestial body | Earth |
Regional usage | Regional |
Definition | |
Chronological unit | Chron |
Stratigraphic unit | Chronozone |
The Allerød oscillation (
The Allerød period was named after a type site in
Dating
The Greenland oxygen isotope record shows the warming identified with the Allerød to be after about 14,100 BP and before about 12,900 BP. C-14 dates from an excavation on the shore of Lake Neuchâtel, Switzerland, furnish a date of 14,000 BP, calibrated, for the start of the Allerød. Pollen cores from Berezina plain, Belarus, give 11,800–10,900 BP uncal. Various researchers have similar ranges: 12,000–11,000, 11,700–11,000, etc. They all seem to roughly concur.[citation needed] The interstadial ended abruptly with a decline in temperatures within a decade and the onset of the glacial Younger Dryas.[2]
The Allerød occurred during the last interstadial of the Pleistocene: the Windermere interstadial of Britain, the Woodgrange interstadial of Ireland and the Two Creeks Interval of North America. Although interstadials are defined by region, the Allerød period is not, being global in its effects; that is, the temperature and sea level rose everywhere, not just in north Europe.
Flora
During the Allerød, which foreshadowed the modern climate, mixed evergreen and deciduous forests prevailed in Eurasia, more deciduous toward the south, just as today. Birch, aspen, spruce, pine, larch and juniper were to be found extensively, mixed with oak and hazel. Grasses were to be found in more open regions.
Fauna
Some animals hunted were the red deer, moose, horse, Irish elk and beaver. The ubiquitous brown bear was present as well.
Humans
Humans in north Eurasia were still in the
Sources
- ISBN 978-0-00-815035-8.
- ^ Wade, Nicholas, Before the Dawn, Penguin Press, 2006. pp. 123-124
- S2CID 165595175.