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Evidence of a giant tyrannosaurid (Dinosauria: Theropoda) from the Upper Cretaceous (?Campanian) of Montana

Urban, MA and Lamanna, MC (2006) Evidence of a giant tyrannosaurid (Dinosauria: Theropoda) from the Upper Cretaceous (?Campanian) of Montana. Annals of Carnegie Museum, 75 (4). 231 - 235. ISSN 0097-4463

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We report an isolated right lacrimal of a tyrannosaurid theropod dinosaur, probably from the Upper Cretaceous (upper Campanian) Judith River Formation of Fergus County, Montana. The lacrimal was originally associated with the holotype of the giant crocodylian Deinosuchus rugosus, but was later identified as that of a tyrannosaurid. It is of comparable size to the corresponding element in the gigantic Maastrichtian tyrannosaurid Tyrannosaurus. Moreover, comparison of the lacrimal to those of other tyrannosaurids tentatively supports its referral to this genus. Consequently, provided that its stratigraphic provenance has been correctly identified, the specimen represents the oldest-known North American record of a Tyrannosaurus-sized tyrannosaurid, and possibly the most ancient occurrence of this genus yet documented.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Urban, MA
Lamanna, MC
Date: 30 December 2006
Date Type: Publication
Journal or Publication Title: Annals of Carnegie Museum
Volume: 75
Number: 4
Page Range: 231 - 235
DOI or Unique Handle: 10.2992/0097-4463(2006)75[231:eoagtd];2
Schools and Programs: Dietrich School of Arts and Sciences > Geology and Planetary Science
Refereed: Yes
ISSN: 0097-4463
Date Deposited: 22 Apr 2014 16:54
Last Modified: 02 Feb 2019 14:55


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