Re: Fastovsky vs Archibald

[Tim Donovan <uwrk2@yahoo.com>]

  Over the past 20 years there have been serious
attempts to assess diversity at various levels within
the Hell Creek and equivalents, by Fastovsky,
Wroblewski etc.

--- Phil Bigelow <bigelowp@juno.com> wrote:

> One point that should be emphasized is that no one
> (to my knowledge) has
> actually conducted a rigorous (e.g., non-anecdotal)
> sampling/statistical
> study of intraformational extinctions within the
> Hell Creek Formation.
>
>
> 
> On Sat, 18 Jun 2005 03:40:41 -0700 (PDT) Tim Donovan
> <uwrk2@yahoo.com>
> writes:
> > 
> > 
> > --- Phil Bigelow <bigelowp@juno.com wrote:
> > 
> > > Fastovsky is correct in concluding that dinosaur
> > > diversity WITHIN the
> > > Hell Creek Formation was not in decline up to
> the
> > > K-T boundary.
> > 
> >   It is possible that lambeosaurs became extinct
> > within Hell Creek time instead of immediately
> prior to
> > it. Boyd made a case for the presence of
> Hypacrosaurus
> > in the lower Hell Creek but AFAIK there is no
> evidence
> > for it in the upper Hell Creek or the lower
> Scollard,
> > which is equivalent.
> >  
> >  
> > > That said, some workers have claimed that a Hell
> > > Creek nodosaur went
> > > extinct before the K-T boundary.  But
> considering
> > > that ankylosaurids are
> > > generally uncommon in the Hell Creek Formation,
> > > there is a good
> > > possibility that the proposed premature nodo
> > > extinction may in fact be
> > > only an artefact of sampling/collecting.
> > 
> >   A. magniventris apparently reached the K-T
> boundary
> > in WY but Edmontonia might have disappeared over
> > 300,000 years earlier.
> > 
> > 
> > 
> > 
> >             
> >
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> 
> 
> 


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