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Re: TRICERATOPS AND PSITTACOSAURUS ARE NOT OVERSPLIT



In a message dated 3/7/01 12:01:21 AM Pacific Standard Time, 
Tetanurae@aol.com writes:

<< T. horridus and T. prorsus do overlap somewhat temporally, but there are 
 periods where the only Triceratops kind in existence was the T. horridus 
 kind.>>

     Is there now enough resolution to Hell Creek/Lance straitigraphy across 
the large area in which it is exposed to make such a statement? I remember 
the difficulties encountered by trying to divide the North Dakota Hell Creek 
into members. This was a while back, however...

<<  Additionally, it seems that when a lot of Triceratops specimens are 
 found together, the kinds don't mix. >>

    Are you talking bonebed? If not, ditto above. DV.