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SCARS ON NMNH P-16106



                                         or

YET MORE DIRECT EVIDENCE OF THEROPOD PREDATION

In Horner's monograph* on _Prosaurolophus blackfeetensis_, he illustrates two
newly discovered skulls that he places into _Kritosaurus navajovius_ and a
new species _Gryposaurus latidens_ as well as illustrating _P.
blackfeetensis_.

On page 109 a new skull described as belonging _Kritosaurus navajovius_ (NMNH
P-16106) is illustrated.  There are numerous 'raking' scars on the frontals
and postorbitals on the roof of the skull just behind the eyes, presumably
from an attack by a theropod that this individual survived.

There are also two very large puncture wounds on the rear of the skull, one
on the left postorbital near the suture with the squamosal, the other on the
right squamosal.  These are almost certainly from a large theropod that bit
the rear of the skull and base of the neck.

My question is: is it possible to tell if these puncture wounds were a) the
cause of death or happened during an attack that was the cause of death or b)
were caused by a scavenging theropod long after death?  

Perhaps Tyrannosaurs attacked the heads oh hadrosaurs since the were fairly
delicately constructed and could easily have caused major damage.

One other question.  This skull has since become the type of either
Anasazisaurus or Naashoibitosaurus, but which one?

Peter Buchholz
Tetanurae@aol.com

"You're an old man.  I don't like old men."

-------------------------------------
*Horner, J R.  1992.  Cranial Morphology of _Prosaurolophus_ (Ornithischia:
Hadrosauridae) with descriptions of two new hadrosaurid species and an
evaluation of hadrosaurid phylogenetic relationships.  Museum of the Rockies
Occasional Paper No. 2:1-119.