The Younger Dryas, about 12,900–11,600 years ago, was an abrupt cold interval during which ice sheets reformed. The video describes it as one of the most extreme changes in five million years. Long before it, the Eemian—about 130,000–116,000 years ago—was warmer than the preindustrial Holocene, with sea level roughly 20–30 feet higher. Meltwater pulse 1B, dated to around 11,500 years ago near the Younger Dryas termination, was linked to rapid deglaciation and sea-level rise. The Holocene has been comparatively stable relative to the glacial cycles before it. The Younger Dryas did not erase the earlier geological record.
Younger Dryas and meltwater pulse 1B reshaped Earth's late-glacial landscape
Key facts
- The video presents the Younger Dryas as one of the most extreme changes in five million years. The established chronology places it at about 12,900–11,600 years ago and identifies it as an abrupt cold interval during which ice sheets reformed.
- The Eemian lasted about 130,000–116,000 years ago, was warmer than the preindustrial Holocene, and reached sea levels roughly 20–30 feet above modern.
- Meltwater pulse 1B is generally dated to about 11,500 years ago, although some chronologies place its onset near 11,600. It was associated with rapid deglaciation and global sea-level rise.
- The video's claim that the Younger Dryas erased the preceding geological record is unsupported; Eemian, glacial and older deposits remain preserved.
- Neither the Eemian nor meltwater pulse 1B dates to 146,000 years ago, so the post's unnamed 'major spike' at that date needs a specific event and record.
- The Holocene was comparatively stable relative to the preceding glacial period and the broader glacial–interglacial cycles.
Sources
randallcarlson.com
Linked in video description
Younger Dryas | Earth and Atmospheric Sciencesebsco.com
The Younger Dryas, occurring 12,900 to 11,600 years ago, was a well-defined climatic event during which cool temperatures returned and ice sheets reformed.
Younger Dryasen.wikipedia.org
The Younger Dryas (YD, Greenland Stadial GS-1) was the final climatic phase of the Last Glacial Period that occurred from around 12,900 to 11,700 years ...
The Younger Dryas impact hypothesis: Review of ...sciencedirect.com
by MB Sweatman · 2021 · Cited by 67 — The proposal is that this impact triggered the Younger Dryas (YD) cooling and contributed to the end-Pleistocene megafaunal extinctions and human cultural ...
Younger Dryas | Definition, Causes, & Terminationbritannica.com
The Younger Dryas was a cool period that interrupted a warming trend at the end of the Pleistocene Epoch, roughly 12,900 to 11,600 years ago.
The case of the Younger Dryas Impact Hypothesis - PMCpmc.ncbi.nlm.nih.gov
by JL Powell · 2022 · Cited by 51 — The hypothesis proposes that the airburst or impact of a comet ∼12,850 years ago caused the ensuing ∼1200-year-long Younger Dryas (YD) cool period. In the ...
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