From Wikipedia, the free encyclopedia Allerød oscillation
Allerød oscillation
The Allerød period was a warm and moist global inter- is, the temperature and sea level rose everywhere, not
stadial that occurred at the end of the last glacial period. just in north Europe.
The Allerød oscillation raised temperatures (in the
northern Atlantic region to almost present-day levels),
before they declined again in the succeeding Younger
Flora
Dryas period, which was followed by the present inter- During the Allerød, which foreshadowed the modern cli-
glacial period. mate, mixed evergreen and deciduous forests prevailed
In some regions, especially in northern Eurasia, there in Eurasia, more deciduous toward the south, just as to-
is evidence for a cold period known as the Older Dryas day. Birch, Aspen, spruce, pine, larch and juniper were to
interrupting the interstadial. In such regions the shorter be found extensively, mixed with Quercus and Corylus.
oscillation ending with the Older Dryas is known as the Poaceae was to be found in more open regions.
Bølling oscillation, and the Allerød period is the intersta-
dial following the Older Dryas.
The Allerød period was named after a type site in
Fauna
Allerød municipality in Sjælland, Denmark (near Copen- Some animals hunted were the red deer, moose, horse,
hagen), where deposits created during the period were Irish elk and beaver. The ubiquitous brown bear was pre-
first identified in work published in 1901 by Hartz and sent as well.
Milthers. This Blytt-Sernander period corresponds to
Pollen zone II. Humans
Humans, who live in houses in north Eurasia were still
Dating in the reindeer hunting stage. A variety of Palaeolithic
The start of the Allerød depends on whether an Older cultures prevailed in Europe: the Federmesser, Lyngby,
Dryas is present and how much time is to be allotted to Bromme, Ahrensburg and Swiderian. To the south and
the latter. A conventional date of 14,000 BP is typical. far east the Neolithic had already begun.
Roberts (1998) uses 13,000 BP for the end of the period.
The Greenland Oxygen isotope record shows the Sources
warming identified with the Allerød to be after about
14,100 BP and before about 12,900 BP. C-14 dates from an [1] Wade, Nicholas, "Before the Dawn", Penguin Press,
excavation on the shore of Lake Neuchatel, Switzerland, 2006. pp. 123
furnish a date of 14,000 BP, calibrated, for the start of the
Allerød. Pollen cores from Berezina plain, Belarus, give External links
11,800-10,900 BP uncal. Various researchers have similar
ranges: 12,000-11,000, 11,700-11,000, etc. They all seem • Belarus
to roughly concur. The interstadial ended abruptly with
a cold period that reduced temperatures back to near-
glacial levels within a decade.[1]
The Allerød occurred during the last interstadial of
the Pleistocene: the Windermere of Britain, the Wood-
grange 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
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Categories:
• Climate history
• Nordic Stone Age
• Pleistocene
• Blytt-Sernander
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From Wikipedia, the free encyclopedia Allerød oscillation
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