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Re: Nanotyrannus

>Was Nanotyrannus and his larger cousin T. Rex contemporaneous?

Yes, both Tyrannosaurus rex and Nanotyrannus lancensis are from the late
Maastrichtian (or "Lancian) of western North America.

                                
Thomas R. Holtz, Jr.                                   
tholtz@geochange.er.usgs.gov
Vertebrate Paleontologist in Exile                  Phone:      703-648-5280
U.S. Geological Survey                                FAX:      703-648-5420
Branch of Paleontology & Stratigraphy
MS 970 National Center
Reston, VA  22092
U.S.A.