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Re: extinction at the K/T boundary

The idea that a comet did in the dinos of course presumes that there was an
unusually big impact at the K/T boundary. In the latest Geology tentative
evidence that the Mexican crater was formed before the K/T was presented. I
hope it proves to be true. Besides, no good impact mechanism for killing off
ALL the few hundred dinosaur species of which - most were probably weed
species with very high rates of reproduction and independent juveniles - has
been offered.