Re: Fastovsky vs Archibald

[Tim Donovan <uwrk2@yahoo.com>]

  See The Dinosauria; the association of Edmontosaurus
with the lowlands has been established for some time.
AFAIK E. regalis is the only hadrosaur known from the
near marine Unit 1. Edmontosaurus and the closely
related Anatotitan remained virtually the only
hadrosaurs in near coastal Lancian habitats several
million years later. About midway between those
periods, Saurolophus and Hypacrosaurus dominated Unit
4, where Edmontosaurus is unknown. This was a more
inland environment, resulting from regression.
Interestingly, Edmontosaurus is the only known
hadrosaur in the Scollard which represented the same
sort of environment, essentially, as unit 4. That
certainly suggests Edmontosaurus was the only
hadrosaur left by the last several hundred thousand
years, and had moved into environments formerly
occupied by others.

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

> 
> Do we have enough good quality depositional
> environment data associated
> with enough articulated Trike and Edmontie
> occurrences to be making
> hypotheses about their preferred paleohabitats? 
> Nearly all of the
> earliest excavations (early 1900s) ignored
> contextual data altogether,
> and even recent excavations have been hit-and-miss
> at recording the dep.
> env. of the site (the presence or absence of such
> data seems to be
> strongly correlated with who is doing the
> excavating).
> 
> <pb>
> --
> 
> On Fri, 24 Jun 2005 03:48:49 -0700 (PDT) Tim Donovan
> <uwrk2@yahoo.com>
> writes:
> > 
> >  
> > > --- GUY LEAHY <xrciseguy@prodigy.net wrote;
> > 
> >   
> > > > In any event, if Hypacrosaurus and
> Edmontosaurus
> > > did
> > > > not prefer the same habitats, the presence of
> > > > Edmontosaurus in the Scollard Formation might
> > > > suggest that the Scollard paleoenvironment was
> not
> > > > to the liking of Hypacrosaurus.
> > 
> >  It is true that the presence of Triceratops and
> > Edmontosaurus suggests a paleoenvironment which
> > excluded lambeosaurs. But the Scollard seems to be
> the
> > kind of relatively dry inland environment which
> > favored Hypacrosaurus and Saurolophus in the late
> > Horseshoe Canyon period. Based on environmental
> and
> > faunal differences, Lehman considered the Scollard
> > part of a Leptoceratops biozone distinct from the
> > Triceratops zone of MT etc. I suspect that by
> Scollard
> > times Edmontosaurus and other taxa moved into more
> > upland habitats left vacant by the waning of
> > lambeosaurs and others.
> > 
> > 
> > 
> >             
> >
> ____________________________________________________
> 
> > Yahoo! Sports 
> > Rekindle the Rivalries. Sign up for Fantasy
> Football 
> > http://football.fantasysports.yahoo.com
> > 
> > 
> 
> 
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com