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Re: when the pycnodont died (was: The K-T boundary in Nanxiong)

At 22.40 12/06/02 +0200, you wrote: 
> Complete and perfectly preserved pycnodonts
> are preserved in the Lagerstaetten of Bolca
> (Verona, NE Italy) which is Eocene (50 my) in age.

Monte Bolca? Wow. Embarrassing for Benton who calls them "Triassic to
Cretaceous" in the text and lets their balloon in the "phylogenetic tree"
attenuate towards and stop at the K-T boundary. :-)

When did they die out, BTW?

The latest dating (presented last Friday in a Symposium of the Italian Paleontological Society), on the basis of alveolinids (benthic forams I am not familiar with) is what Italian micropaleontologists call "Cuisiano Medio" or SBZ 11 biozone (Lower Eocene ca. 50 millions years ago).
All the best,
Silvio


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Silvio Renesto

Dipartimento di Scienze della Terra
Università degli Studi di Milano
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