The Earth experience "The Younger Dryas" somewhere between 12,700 and 12,900 years ago which was another mass extinction event.

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Between 12,700 and 12,900 years ago, Earth experienced the onset of the Younger Dryas, an abrupt, intense return to ice-age conditions often attributed to the Younger Dryas Impact Hypothesis. This cataclysmic event involved rapid, severe global cooling, massive environmental upheaval, and a major extinction event. 

Key Aspects of the Event:

• Trigger (Hypothesized): Many researchers propose that a fragmented comet or asteroid exploded in the atmosphere, creating shockwaves and fires, with evidence found in high levels of platinum, nanodiamonds, and soot in geological layers.
• Climate Chaos: The Northern Hemisphere, in particular, saw temperatures plummet by up to 14 degrees Fahrenheit in only a few years, halting the overall warming trend that followed the last ice age.
• Extinction and Cultural Change: This event is linked to the disappearance of North American megafauna, including mammoths and mastodons. It also coincides with the collapse of the prehistoric Clovis culture, which likely suffered due to the rapid environmental shift.
• Lasting Impact: The cold period lasted about 1,400 years, drastically altering ecosystems across the globe. 

While the "impact hypothesis" is debated among scientists, it is strongly supported by widespread geological markers from that period. 

• Younger Dryas impact hypothesis - Wikipedia

  Younger Dryas impact hypothesis - Wikipedia.

  

  

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