RE: More on Parasaurolophus

["Tim Donovan" <msdonovan66@hotmail.com>]

> From: "Thomas R. Holtz, Jr." Reply-To: tholtz@geol.umd.edu To: , Subject: 
> RE: More on Parasaurolophus Date: Fri, 26 Jul 2002 09:18:47 -0400
>
> > From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of 
> > Steven Coombs > > >What horizon/formation did Parasaurolophus hail from? 
> > > P. walkeri: Dinosaur Park Fm (Alberta), Hell Creek Fm(?) (Montana). > 
> P. tubicen: Kirtland Fm (New Mexico). > P. cyrtoccristatus: Fruitland Fm 
> (New Mexico.
>
> How secure is your Hell Creek reference?
I notice "?Parasaurolophus walkeri" is included in the list for the Hell 
Creek on page 118 of The Dinosauria. For a long time I assumed that must 
have been a misidentified or reworked element, but recently I heard of a 
"probable lambeosaurine" from the Hell Creek. I understand the ischium of 
this specimen is mostly complete and apparently represents a 
lambeosaurine-presumably more robust than a hadrosaurine ischium. I wonder 
if this represents a late surviving Hypacrosaurus, or perhaps an immigrant 
from some other region(the lambeosaur-like Pararhabdodon?) or perhaps 
hadrosaurine radiation into the niche left vacant by the disappearance of 
lambeosaurines c mid Maastrichtian.
Sullivan and Williamson (1999. NM
> Mus. Nat. Hist. & Sci. Bull. 15) discuss the record of the taxon, and list 
> the specimens as from the following units: BYU 2467 Kaiparowits Fm. (late 
> early to late Campanian, based on palynomorphs, contra previous 
> correlations to the Maastrichtian) FMNH P27393 (type of P. cyrtocristatus) 
> upper Fruitland Fm. or lowest member of Kirtland Fm. (exact horizon is 
> under scrutiny) (Campanian) PMU.R1250 (type of P. tubicen) De-na-zin 
> Member, Kirtland Fm. (Campanian, 73 Ma) NMMNH P-25100 De-na-zin Member, 
> Kirtland Fm. ROM 768 (type of P. walkeri) Dinosaur Park Fm. (late 
> Campanian) SMP VP-1090 Fruitland Fm. (late Campanian)
>
> As such, all these records show Parasaurolophus as a mid-late Campanian 
> taxon.
>
> > >What type of dinosaurs (including avians) are known from there?
>
> Yikes! Lots. Check out various papers in NM Mus. Nat. Hist. & Sci. Bulletin 
> 17 for the Kirland and Fruitland Fms., and Ryan & Russell's chapter in 
> Mesozoic Vertebrate Life for the Dinosaur Park Fm. dinos. However, both 
> these lists lack the birds.
>
> > >Does anyone think it was possible that hypsilophodontids hunted > bugs 
> near > >colonies of hadrosaurs like in "The Presence of Dinosaurs"?
>
> Possible, sure. Able to demonstrate, much, much more difficult!!!
>
> Thomas R. Holtz, Jr. Vertebrate Paleontologist Department of Geology 
> Director, Earth, Life & Time Program University of Maryland College Park 
> Scholars College Park, MD 20742 http://www.geol.umd.edu/~tholtz/tholtz.htm 
> http://www.geol.umd.edu/~jmerck/eltsite Phone: 301-405-4084 Email: 
> tholtz@geol.umd.edu Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796

_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com