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Re: ?Latest paper on the extinction of dinosaurs in North America

> Whoops.  That's not correct.  Pearson et al. mapped the highest-occuring
> fossils in relation to the *palynological K-T boundary*, not to the
> iridium layer.

They do state, though (as I quoted), that the palynological boundary
coincides with the Ir spike. I just expect that they didn't do the
geochemistry for every single site.