[Disestablishmentarian]

You’re certainly on a roll with those extinction events, SVD.

Are you aware that at the start of the Younger Dryas (10,900 B.C.) there was a cataclysmic event which created the Great Lakes and set the atmosphere of North America on fire, incinerating all above-ground flora and fauna, including the so-called Clovis Indian culture?

Most likely this was an electrical discharge from another planetary body whose plasma envelope impinged upon that of Earth. The average temperature of the Earth plummeted by 18 degrees F. for the next 1,500 years as a result of ash and dust orbiting in the stratosphere. It was literally a period of darkness over the whole Earth, causing large animals to go extinct outside the tropics.

[numberonepal]

It was comet fragments that caused the event. The bitch part is that for about 20 years the earth kept getting hit every year when it would orbit back around to the comet fragments.

[Steve Van Doorn]

my file name for all of this is called "Clovis." I'm convinced the Clovis people where a race of people that where far more advanced then we realize. They where the oldest civilization on the planet I believe.
Some of these structures I believe are older then göpleki tepe. Poverty Point Lower Mississippi Valley is a massive structure we don't even know how big it was. It could've been a full circle Colosseum that most of it washed away.
Ancient monuments of the Mississippi Valley (1821-1888)
https://archive.org/details/ancientmonuments00squi/mode/2up?

said, "Most likely this was an electrical discharge from another planetary body whose plasma envelope impinged upon that of Earth."

The Bubble around the earth. yes. This seems to be associated with the super nova of Upper Centaurus-Lupus. The timing is right. this was the start of glaciation of Antarctica
https://stsci-opo.org/STScI-01FS7HT1GPAKEP18WY6RG95Q26.pdf

[Steve Van Doorn]

said, " Most likely this was an electrical discharge from another planetary body whose plasma envelope impinged upon that of Earth"

Wait. you're not talking about the bubble. you're talking about the Younger Dryas.

I believe our sun goes through cycles that are recognized as the Dansgaard–Oeschger 1500 year cycle more noticeable during glaciation (last one was Roman Warming period to the Maunder Minimum.) The Heinrich cycle which is a 6,000 year cycle last even we recognize as the Noah Event likely associated with the Burckle Crater this huge asteroid hit the Indian Ocean. But every other Heinrich cycle seems to be larger which the last was the Younger Dryas.