Hey LinearAQ, just to amuse folks I'll pick a nit with you.

Strictly speaking a meteor strike is a stochastic event. It is also rapid compared to generation times. The organisms that happen to be in the impact area are usually wiped out, regardless of their adaptations, and those that are not in the impact area usually survive the impact event due to location rather than any adaptations. As such there is no selection by the meteor impact. Organisms that are killed by chance events don't directly affect evolution, what happens is that their removal can also result in certain alleles being lost to a population, and this is called genetic drift rather than selection.

The effect of a meteor beyond the impact event depends on the size of the meteor and the location of the impact. A small meteor can throw up a cloud of hot gases generated by the impact energy that then dissipate in the atmosphere in a matter of days. A large meteor can throw up such a large cloud that the sun is blocked for many weeks and change the climate (the "nuclear winter" scenario). This is where selection comes in, after the initial impact and during the secondary effects, and the effect on evolution would depend on how severe it was and how long it lasted.

Enjoy.