[Pete from Shawnee Mission]

It is thought by some that a large comet or asteroid exploded above the Laurentide Ice Sheet in Canada around 12,000 years ago and initiated its break up and melt. This was responsible for causing the Great Lakes and Lake Agassiz, and possibly the creation of the Hudson Valley. This glacial melt, along with the Melt in Scandinavia, may have been responsible for raising sea levels and flooding the Mediterranean Basin and the Black Sea, and creation of the English Channel.

https://www.scientificamerican.com/article/did-a-comet-hit-earth-12900-years-ago/

https://en.wikipedia.org/wiki/Lake_Agassiz

http://poughkeepsieyachtclub.org/articles-blog/2020/5/27/how-was-the-hudson-formed

[Disestablishmentarian]

The shape of the Great Lakes, shaped like cones with the deepest part in the middle, is more characteristic of lightning strikes than an impact or explosion of an asteroid.

Sorry, but on this topic Scientific American and Wikipedia are useless. Created by the same scientific idiots that once claimed glaciation formed the Lakes.

At the deepest part, the center of the inverted cone, Lake Superior is about a mile deep.

Steve’s concept of a companion star is at least compatible with the facts. However, I find a planet much more likely. Saturn and Jupiter were both, in their turns, considered to be the “Sun” of ancient/prehistoric peoples throughout the world.