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Thanks to Josh for his thoughts on the age of the Liaoning beds. One
quick comment. Josh wrote...
> To use _Sinosauropteryx_, for example, to
> support a Tithonian age for the basins that contain it because it
> looks like a Tithonian form, is fraught with problems when the sample
> size is in the single digits and all of the specimens come from within
> the rocks in question themselves.
Furthermore, there are other very _Compsognathus_-like forms from
indisputable Cretaceous rocks (Owen 1876, Naish 1999, Martill et al.
2000). And incidentally, as Nick Longrich has discussed here before,
the type specimen of _Sinosauropteryx prima_ is pretty clearly not that
similar to _Compsognathus_. HOWEVER, GMV 2124 (the second
specimen - one with mammal jaws in its gut) is similar to
_Compsognathus_ (and thus probably a compsognathid).
Hopefully the thing with _Sinosauropteryx_ will eventually get
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