[Calvin Locke]

but rather to look for meteoroid dust

I could have sworn they found said dust embedded in trees that survived the blast.

[Strategerist]

Yeah, the most generally accepted theory is it was a stony meteorite that detonated at an altitude of 5 miles, with larger pieces simply being swallowed by swamp. They did find characteristic dust in tree sap.

Russians seem to still cling to the comet thing. Reality is there isn’t a sharp line between some asteroids and a dead comet.