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At 01:23 PM 7/20/00 -0400, you wrote:
>Tarbosaurus efremovi specimens outnumber Jenghizkhan
>bataar specimens by about 15 to 3. If T. efremovi is a juvenile or subadult
>of a larger species, why are most of the specimens of this species juveniles
>and subadults, throughout all of the Mongolian Upper Cretaceous? How many
>juvenile or subadult Tyrannosaurus rex specimens are there in North America?
>How about Gorgosaurus, Albertosaurus, and Daspletosaurus?
There are only a few juvenile/sub-adult specimens of Tyrannosaurus rex
(AMNH 5005, AMNH 21542, CMNH 7541, "Tinker"). There are also a few
Daspletosaurus juvenile/sub-adult specimens (CMN 11315, MOR 590, RTMP
94.218.1). I am led to believe that there are several Albertosaurus
juveniles (it would take a while to search them out, but I can if somebody
wants to know). There are lots of Gorgosaurus juvenile/sub-adult specimens
(CMN 2270, CMN 12063, RTMP 85.11.3, RTMP 86.144.1, RTMP 94.12.155, AMNH
5432, AMNH 5664, ROM 436, ROM 1247, RTMP 83.36.100, RTMP 91.36.500, AMNH
5336, CMN 2193, ROM 1422, ROM 4591). I have actually wondered why there
are so few adult Gorgosaurus specimens.
Darryl Jones <email@example.com>
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