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RE: tooth question
From: Thomas R. Holtz, Jr. [SMTP:firstname.lastname@example.org]
Sent: Wednesday, January 27, 1999 7:54 AM
Subject: RE: tooth question
Well, the evidence seems to be coming in from many dinosaur lineages
(hadrosaurids, troodontids, sauropods, etc.) that a period of fast
was followed by a big slow down. (Dryosaurs, for some reason, have
style bone growth). The data look pretty good to me. However,
"ageing" of dinosaur individuals done in the 1980s and early-to-mid
as has been shown by recent work by Horner and others, the old "1
LAG = 1
growth year" paradigm doesn't seem to hold, as different bones in
individual have different numbers of LAGs!
I have to say that no one, to my knowledge, has published any growth
studies for T. rex (the only small T. rex postcranium known is the
"A. megagracilis"). Such a study would be feasible for T. bataar or
Gorgosaurus libratus, but at present nobodies done that work.
based on the widespread presence of this pattern among dinosaurs, I
be surprised if it held for tyrants as well.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:email@example.com
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661
Much thanks! :-) Something that occurred to me when I was reading
"The Complete T. rex" was this: if this variation in growth rate did happen,
one practical advantage could be a reduced effective basal
thus (perhaps) requiring less food?