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T. rex tracks ID issues

From: Ben Creisler

In new Ichnos:

Martin Lockley, Paul R. Janke & Mike Triebold (2011)
Tracking Tyrannosaurus: Notes on Purported T. rex Tracks
Ichnos 8 (3): 172-175

Purported T. rex tracks (genus Tyrannosaurus) are rare 
and, if poorly preserved, difficult to identify or to 
distinguish with certainty from the tracks of hadrosaurs 
found in the same deposits. Six possible Tyrannosaurus 
tracks have been reported, five of which appear to be the 
right age, that is, Maastrichtian. However, at least two, 
including one that is pre-Maastrichtian, are interpreted 
as hadrosaur tracks.