Re: Fastovsky vs Archibald

[Tim Donovan <uwrk2@yahoo.com>]

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

> What
> did the authors have to say specifically about
> (?)Hypacrosaurus and
> Edmontonia?


 AFAIK there is no evidence of Hypacrosaurus in the
Ferris. Edmontonia is present but the last occurrence
is 200m below the K-T boundary. Interestingly,
Edmontonia disappears at the point where a change in
sedimentology is said to preclude significant
reworking. That suggests it was gone well before
351,000 years before the K-T -indicated by the level
of the last occurrence and sedimentation rate. So
Carpenter may have been right in 1986.
 
 
> The Lance Fm. may provide a better test of
> Edmontonia's purported
> premature extinction, because the evidence for this
> hypothesis is pretty
> ambiguous in the Hell Creek Fm.


  The Ferris may provide the best test in view of
absence of reworking toward the end.

Tim



                
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