Kevin O. Pope is the former NASA archaeologist and founder of Geo Eco Arch Research who helped connect the Chicxulub Crater to the Cretaceous–Paleogene extinction event.
It would require significantly more fine dust to be generated in order to create this effect than has been detected [1].
He has also questioned whether the current size of an asteroid thought to be large enough to create a global impact is in fact too small.
He believes that these may have formed due to the Bedout impact as it would require enormous forces to deform the quartz.
The Bedout impact coincides with the Permian–Triassic extinction event, the period known at the end-Permian where 90% of Marine and 80% of land life disappeared.