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Re: extinction (long)
> However much of the seawater vaporized by the impact would have
> been carried into the stratosphere together with massive amounts
> of chlorine (also iodine, bromine &c). This must have had drastic effects
> on the ozone layer.
If the nitrogen oxides had left any ozone layer. B-) Well, the halogens
would stay up there much longer than the nitrogen oxides, so they may well
have prolonged its absence.