Evolution
Evidence from the rock record has
shown interesting paths of evolution especially concerning the extinction
of the Jurassic Plesiosaur. A Fossil (Bakker 1993) was found in the Sundance
Formation in Wyoming of what appeared to be a long-necked Plesiosaur.  Analysis
later proved that the long-necked "swan-lizards" of the Cretaceous
were not direct descendants of the long-necked Plesiosaurs of the Jurassic,
but instead "taxonomic" impostors. What this suggests is that
the Cretaceous long-necked Plesiosaurs evolved from Jurassic Pliosaurs
(Bakker, 1993). |
| Copyright Ancient Marine Reptiles (Callaway and Nicholls, 1997) |
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