Gorgosaurus and Albertosaurus

[RaptorRKC@aol.com]

To all:

What a coincedence!  I write down another question the other day (one out of
64 more, I believe) concerning the two animals mentioned in the subject line.
 And now, out of the blue, my question is being answered!  How miraculous! 

But not answered quite to the fullest yet.

The original question I wrote down, but never posted, went somewhat like
this:

The type species of _Albertosaurus_ is _A. sarcophagus_, if I remember
correctly.  Is _A. sarcophagus_ known from good enough remains to determine
if it is a valid species?  Known well enough to place other species (_A.
libratus, A. arctungius, etc.) within the genus?  If not, does this mean
other species placed in _Albertosaurus_ belong in other genera?  Does this
mean that it was a mistake to 'dump' _Gorgosaurus_ in the first place?

(Not exactly one question, but multiple questions asking generally about the
same thing, as you may notice.)

So, is _Gorgosaurus_ valid or not?  If so, which species does it contain?
 What will happen to _A. sarcophagus_?

This is so sad -- Albertosaurus was such a fine name!  Much more elegant that
Gorgosaurus any day.

R.K. Clark