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Re: dracrorex and National Geographic



To Ken: Thanks for posting the abstract. I do wonder how you managed to do it 
though (apart from typing it of course): I have found it immeasurably annoying 
that the SVP2007 abstracts volume PDF does not allow you to cut and paste text. 
You can search but not cut and paste. Why?

D.
 
----------------------------------
Denver Fowler
df9465@yahoo.co.uk 
Work:
http://www.museumoftherockies.org
 
Fieldwork  pictures NM 2002-4 & China 06:
http://www.statemuseumpa.org/notes05.htm
http://www.wald.heim.at/urwald/540645/JH-Projekte/China_04-2006/chinaset.htm
 
TV Work:
http://www.impossiblepictures.co.uk
http://www.bbc.co.uk/dna/h2g2/A664661
 
Art:
http://dino.lm.com/artists/display.php?name=df9465
-----------------------------------

----- Original Message ----
From: "Ken.Carpenter@dmns.org" <Ken.Carpenter@dmns.org>
To: dinosaur@usc.edu
Sent: Monday, 26 November, 2007 4:22:54 PM
Subject: RE: dracrorex and National Geographic

What the abstract says (note it is Horner, Goodwin and Woodward and is
presented as a hypothesis):

Technical Session IX, Friday 11:15
SYNONOMY CONSEQUENCES OF DINOSAUR CRANIAL ONTOGENY HORNER, John,
 Montana
State University, Museum of the Rockies, Bowman, MT USA; GOODWIN, Mark,
University of California, Berkeley, Museum of Paleontology, Berkeley,
CA, USA: WOODWARD, Holly, Montana State University, Museum of the
Rockies, Bozeman, MT USA
The effect of cranial allometry during the growth of dinosaurs cannot
 be
overlooked in distinguishing taxonomic differences from individual,
ontogenetic, or sexual variation. This ontogenetic problem was
recognized in tyrannosaurids from the Nemegt Formation of Mongolia by
Rozhdestevensky in 1965, and quantitatively resolved in lambeosaurine
hadrosaurs by Dodson in 1975. Subsequently, additional discoveries of
various ontogenetic series, such as the recently described cranial
series of Triceratops, confirm Dodson's findings that dinosaur juvenile
morphology was retained for an extended period, until the skulls
attained nearly adult proportions (based on average adult cranial
dimensions). Several groups of dinosaurs hatched from their eggs, grew
to approximately 3/4 adult size while retaining many juvenile cranial
morphologies, and then underwent rapid cranial development of adult
characteristics (hypothesized as display features). The severity of
 this
cranial allometric transformation is well illustrated in our
hypothesized ontogenetic stages of Pachycephalosaurus. Comparative
cranial morphology supplemented by computerized tomography and
osteohistology of the taxa Dracorex, Stygimoloch and
 Pachycephalosaurus,
all from the Upper Cretaceous Hell Creek Formation of Montana, and
adjacent states, support an alternative interpretation that these taxa
form an ontogenetic series of the single taxon Pachycephalosaurus.
Extreme ontogenies such as this have important consequences for many
current phylogenetic, ecologic, and evolutionary hypotheses relating to
dinosaurs.
JVP 27(suppl. To 3): 92A





Kenneth Carpenter, Ph.D.
Curator of Lower Vertebrate Paleontology & Chief Preparator
Department of Earth Sciences
Denver Museum of Nature & Science
2001 Colorado Blvd.
Denver, CO 80205 USA

Office phone: 303-370-6392
Museum fax: 303-331-6492
---------------------------------------------------------------
For PDFs of some of my publications, as well as information of the
 Cedar
Mountain Project:
https://scientists.dmns.org/sites/kencarpenter/default.aspx
(if you have problems with the link, cut and paste it into the browser
address bar)
-----------------------------------------------------------------
The scientific method is a myth:
http://www.dharma-haven.org/science/myth-of-scientific-method.htm
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