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Re: Giant Impact Near India -- Not Mexico -- May Have Doomed Dinosaurs

 There's also the point that asteroid impacts that happen to occur
 around the time there's already major flood vulcanism going on seem
 to do more ecological damage and produce extensive mass extinctions.

1) The biggest Phanerozoic crater that is securely dated is the Chicxulub crater... that's unfortunately a sample size of 1. 2) The main episode of flood basalt eruptions ended 100,000 years before the K-Pg boundary; on a global scale, it had no impact except a transient rise in (CO2 and therefore) temperature.

BTW, while the marine P-Tr mass extinction was indeed a sight to behold, the terrestrial one could have been less severe than the K-Pg one. It's all a bit strange.

Are any flood basalts dated to the D-C boundary (Hangenberg Event)? Because that's a mass extinction that looks much more severe now than it did 10 years ago, and it's the first one for which an impact was seriously proposed as the cause (I think in the 1960s).