Date of Award

Fall 2010

Degree Name

Master of Science (MS)

Department

Geosciences

Advisor

Dr. Richard J. Zakrzewski

Abstract

A disarticulated skeleton of a theropod from the Late Jurassic (Tithonian) strata of McElmo Canyon in Montezuma County, Colorado was discovered in 1953 by the late J. T. Gregory and D. Techter. For nearly 55 years the specimen remained unnoticed in the collection of the Yale Peabody Museum of Natural History in New Haven, Connecticut. Several cranial and postcranial elements are relatively well preserved and include the premaxilla, maxilla, dentary, teeth, quadratojugal, braincase, metacarpals, partial pubis and ischium, astragalus, partial tibia and fibula, metatarsals, pedal phalanges, and several partially preserved ribs. The specimen represents a new genus and species of basal carcharodontosaurid, which shares some morphological similarities with Late Jurassic allosaurids. As such, the new genus and species is the first unequivocal carcharodontosaurid from the Late Jurassic of North America. The presence of a North American carcharodontosaurid during the Late Jurassic provides evidence that the clade may have originated on that continent and that the Carcharodontosaurids split from the allosaurids in the Middle or Early Jurassic.

Rights

Copyright 2010 Sebastien Dalman

Library Call Number

LD2652 .T5 G4 D356 2010

Comments

Notice: This material may be protected by copyright law (Title 17 U.S. Code).

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