Younger Dryas

The Younger Dryas stadial, also referred to as the Big Freeze, was a geologically brief (1,300 ± 70 years) period of cold climatic conditions and drought which occurred between approximately 12,800 and 11,500 years BP (before present). The Younger Dryas stadial is thought to have been caused by the collapse of the North American ice sheets, although rival theories have been proposed.

It followed the Bølling-Allerød interstadial (warm period) at the end of the Pleistocene and preceded the preboreal of the early Holocene. It is named after an indicator genus, the alpine-tundra wildflower Dryas octopetala. In Ireland, the period has been known as the Nahanagan Stadial, while in the United Kingdom it has been called the Loch Lomond Stadial and most recently Greenland Stadial 1 (GS1). The Younger Dryas (GS1) is also a Blytt-Sernander climate period detected from layers in north European bog peat.

The Dryas stadials were cold periods which interrupted the warming trend since the Last Glacial Maximum 20,000 years ago. The Older Dryas occurred approximately 1,000 years before the Younger Dryas and lasted about 300 years. The Oldest Dryas is dated between approximately 18,000 and 15,000 BP.

Read more about Younger DryasAbrupt Climate Change, Global Effects, Causes, End of The Climate Period, Effect On Agriculture, Cultural References

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Timeline Of Environmental History - Pre-Holocene (1.5 Mya)
... "cold snaps" and "warm snaps", such as the Older Dryas and the Holocene climatic optimum, as well as heavier precipitation. 13,000 BC Oldest Dryas stadial (cool period) during the last Ice age/glaciation in Europe. 12,000 BC Bølling oscillation interstadial (warm and moist period) between the Oldest Dryas and Older Dryas stadials (cool periods) at the end of the Last glacial period ...
Clovis Culture - Disappearance of Clovis
... Further information Younger Dryas The most commonly held perspective on the end of the Clovis culture is that a decline in the availability of megafauna, combined with an ... been hypothesized that the Clovis culture saw its decline in the wake of the Younger Dryas cold phase ... The largely discredited Younger Dryas impact hypothesis suggests that one or more bolide impacts caused the mass extinction and triggered a period of climatic cooling ...
Younger Dryas - Cultural References
... always with the same explicit links to the Younger Dryas event as is the case of Robinson's work ...
Younger Dryas Impact Hypothesis
... The Younger Dryas impact hypothesis or Clovis comet hypothesis is the hypothesized large air burst or earth impact of an object or objects from outer space that initiated the Younger ... The Younger Dryas ice age lasted for about 1,200 years before the climate warmed again ...
Climate Of Mount Kenya - Past Climate - Overview
... climate at 50, 35, 30, 24, 16 and culminating with the Younger Dryas period 12kya ... Before the Younger Dryas temperatures were similar to present but the forest cover incomplete ... During the younger Dryas 12.9-11.5 kya brought about by the last Heinrich event, there was a pronounced weakening of the summer monsoon over East Africa, and montane forest retreated and East African ...

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