This may have triggered an extinction event. At this point, that is an unsupported hypothesis. Scientists postulate a general time period in which a major extinction event is likely to have occurred, but have not yet been able to pinpoint the cause or the point of origin.
One thing that makes this especially intriguing is that it did not happen 60-some million years ago, ala Alvarez, but in the time when modern humans were propagating. It therefore must have had a direct disruptive impact on human life, and not just upon those near the impact crater. The climate could have destabilized globally, which would have affected humans through the food supply, and through unexpected climatic events for which they would have been completely unprepared. (Imagine primitive humans, living placid lives in a Hawaii-like climate, suddenly facing an Alaskan winter, for example.)
Anyway, at this point we are dealing with suppositions and possibilities, but it definitely arouses ones curiosity. There is so much yet to learn.