said,
"more characteristic of lightning strikes than an impact or explosion of an asteroid" I didn't think of that. Though my concept would create a massive electrical storm. Given this it does fit with my theory.
My opinion a very large CME blast from our sun. The concussion alone would be massive that would trigger massive lighting storms. The concussion would cause an instant cavity in the ice pack throwing up enough ice to cause the Carolina Bays.
The Meteor from our sun is a Chondrite meteor which would explode very high over Michigan. Chondrite meteors always explode on entry with only fragments that remain. They're composed of Framboid(FeS2),iridium, Nano-diamonds, platinum, Aluminium-26 and amino acids. The heavier materials would continue on the same path coming in from the north East and widen its pattern (I believe.) Those heavier materials created the black mat.
The lighter materials would be amino acids and Surfer which I found two gypsum(CaSO4·2H2O) mines in the logical light material impact areas of Michigan (42°54'00.0"N 85°42'00.0"W and 42.9414°N 85.7006°W near each other)
Framboidal iron oxide: Chondrite-like material from the black mat, Murray Springs, Arizona framboidal particles.
https://cosmictusk.com/wp-content/uploads/Framboidal-iron-oxide-Chondrite-like-material-from-the-black-mat-Murray-Springs-Arizona.pdf Disestablishmentarian. i have so much on Sirius being our binary star I have no doubt anymore. you can pick my brain or start here:
https://youtu.be/I3ZDcj0kF_0