Younger Dryas

Younger Dryas, Time period.

The Younger Dryas (around 12,900 to 11,700 years BP) was a return to glacial conditions after the Late Glacial Interstadial, which temporarily reversed the gradual climatic warming after the Last Glacial Maximum (LGM) started receding around 20,000 BP. It is named after an indicator genus, the alpine-tundra wildflower Dryas octopetala, as its leaves are occasionally abundant in late glacial, often minerogenic-rich sediments, such as the lake sediments of Scandinavia. Physical evidence of a sharp decline in temperature over most of the Northern Hemisphere has been discovered by geological research. This temperature change occurred at the end of what the earth sciences refer to as the Pleistocene epoch and immediately before the current, warmer Holocene epoch. In archaeology, this time frame coincides with the final stages of the Upper Paleolithic in many areas. The Younger Dryas was the most recent and longest of several interruptions to the gradual warming of the Earth's climate since the severe LGM, about 27,000 to 24,000 years BP. The change was relatively sudden, taking place in decades, and it resulted in a decline of temperatures in Greenland by 4 to 10 °C (7.2 to 18 °F), and advances of glaciers and drier conditions over much of the temperate Northern Hemisphere.

Younger Dryas impact hypothesis
4 months ago

Younger Dryas impact hypothesis ... The Younger Dryas impact hypothesis or Clovis comet hypothesis posits that fragments of a large (more than 4 kilometers in diameter), disintegrating asteroid...

Older Dryas
4 months ago

Older Dryas ... the Older Dryas and the Younger Dryas (c. 12,900–11,650 BP). In northern Scotland, the glaciers were thicker and deeper during the Older Dryas than the...

Late Pleistocene
5 months ago

Late Pleistocene ... Oldest Dryas (stadial), the Bølling oscillation (interstadial), the Older Dryas (stadial), the Allerød oscillation (interstadial) and finally the Younger Dryas...

Dryas octopetala
4 months ago

Dryas octopetala ... Dryas octopetala, the mountain avens, eightpetal mountain-avens, white dryas or white dryad, is an Arctic–alpine flowering plant in the family Rosaceae...

Clovis culture
5 months ago

Clovis culture ... was replaced by several more localized regional societies from the Younger Dryas cold-climate period onward. Post-Clovis cultures include the Folsom...

Last Glacial Period
4 months ago

Last Glacial Period ... Period (LGP) occurred from the end of the Eemian to the end of the Younger Dryas, encompassing the period c. 115,000 – c. 11,700 years ago. The LGP is...

Oldest Dryas
4 months ago

Oldest Dryas ... BP. As with the Younger and Older Dryas events, the stratigraphic layer is marked by abundance of the pollen and other remains of Dryas octopetala, an...

Dryas (plant)
4 months ago

Dryas (plant) ... erect and white with a yellow centre (Dryas integrifolia, Dryas octopetala) or pendulous and all-yellow (Dryas drummondii), and held conspicuously above...

Weichselian glaciation
4 months ago

Weichselian glaciation ... Peninsula and the White Sea were free from ice during the Younger Dryas. Before the Younger Dryas, deglaciation had not been uniform and small ice sheet...

Pleistocene
5 months ago

Pleistocene ... the Younger Dryas cold spell. The end of the Younger Dryas has been dated to about 9640 BC (11,654 calendar years BP). The end of the Younger Dryas is...

Magicians of the Gods
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Abrupt climate change
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Natufian culture
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Ahrensburg culture
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10th millennium BC
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African humid period
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Quaternary extinction
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Dryas
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Lake Agassiz
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