https://phys.org/news/2018-05-life-recovered-rapidly-impact-site.html

Scientists were surprised by the findings, which undermine a theory that recovery at sites closest to the crater is the slowest due to environmental contaminants—such as toxic metals—released by the impact. Instead, the evidence suggests that recovery around the world was influenced primarily by local factors, a finding that could have implications for environments rocked by climate change today.

"We found life in the crater within a few years of impact, which is really fast, surprisingly fast," said Chris Lowery, a postdoctoral researcher at the University of Texas Institute for Geophysics (UTIG) who led the research. "It shows that there's not a lot of predictability of recovery in general."