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Re: extinction



> There is no thin, single, isochronous, impact-related
> iridium layer around the world.

:-o

Then what is it what we're finding in some 150 sites all around the world,
in terrestrial as well as in deep-sea sediments?

Once again, I recommend the paper by Turki et al. on the catastrophic and
_sudden_ extinctions of planktonic forams in Tunisia.