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Re: tyrannosaur species overlap in NA on turkey-day

Species of Daspletosaurus and Gorgosaurus overlapped in time AND space.

When Tyrannosaurus was around, it was the only tyrant in North America
(unless Nanotyrannus is a real taxon, in which case they overlapped in
time and space.)

Figure 4 of
shows these pretty well. But note: the upper range of Albertosaurus and
the lower range of Tyrannosaurus are at present poorly constrained.

On Thu, November 28, 2013 5:27 am, Hammer wrote:
> As (hopefully) most of us sit down today for a nice big dinner of
> avian-dinosaur 'n' cranberry sauce,
> I was wondering what is known of what species of tyrannosaurs were alive
> at the same time(s) in
> North America - i.e., was Daspleto still around when Rex appeared, etc.?

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Fax: 301-314-9661

Faculty Director, Science & Global Change Program, College Park Scholars
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA