[blam]

"further, why would a comet choose to “explode” and leave a layer of soot across N America like one would expect with a full eruption of Yellowstone?"

When Yellowstone erupts it leaves a six foot deep ash layer as far away as Nebraska. You know, little things like that. (Ahem)

It exploded for the same reason the Tunguska Event did in 1908.

[Coyoteman]

Good article. This makes for some interesting research.

It exploded for the same reason the Tunguska Event did in 1908.

Incidentally, there is no truth to the persistent rumor that the Tunguska Event was caused by Darwin Central! Besides operative Tesla was working on something else at the time!