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Re: How long for Genus
In a message dated 97-02-05 12:55:08 EST, you write:
> Example: the genus Allosaurus?
> Could this genus have lasted into the late Early Cretaceous? about 20
> million year gap between Late Jurassic _Allosaurus fragilis_ and
> Australia's Early Cretaceous _Allosaurus robustus_.
That does seem a very long time let alone the distance for the genus
Allosaurus! Marsh had made the mistake of assigning the name 'Allosaurus
medius' to a large theropod tooth found in the Arundel Clay Formation
(Aptian) of Maryland beliving that the horizon was of Jurasic age. Then it
was assigned to Dryptosaurus medius. a Late Cretaceous genus! I believe that
when the dust settles on the Arundel material that it will turn out to be
relative of, if not, Acrocanthosaurus, an Allosaurid! But stranger things
My humble 2 cents...
Thomas R. Lipka