From Harvard, in case anyone still cares: the 3.26 Gy carbonaceous impact.
This monster was 50-200 times Chicxulub. Luckily our life here 1.307 Gy on the mainsequence was still purple, not yet green.
It does bring up some interesting constraints on life elsewhere however. Lacking anything significant between the HZ out to the nearest gas giant: C bolides gonna bol'. S too. At the same time a reasonably-tectonic world might throw up some Siberian or Deccan flows.
We might get life but all the chaos will knock a lot of it down.
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