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Re: giant toothed bird-species or genus that lasts 50 million yrs?

To answer this question, individual dinosaur species seem to last less
than 2 million years, and in cases where we have pretty good
resolution, span less than a million years apiece. See the
biostratigraphic chart here for the Dinosaur Park Formation for
example: http://en.wikipedia.org/wiki/Dinosaur_Park_Formation (which
is based mainly on Arbour et al. 2009). The only species that are
known to span 1.5 Ma or more (e.g. _Euoplocephalus tutus_) are those
which have been cited in the literature as probably over-lumped.


On Thu, Oct 27, 2011 at 9:33 AM, Brian Hathaway <hammeris1@att.net> wrote:
> Yes, but what I am trying to ask is would an
> "Apatosaurus firstuvus" as a species last 10's of millions of years before
> "secundus" came around - or a species very closely related such as eastern and
> diamondback rattlers - not rattlesnakes as a whole or a very large genus.
> It would seem at first glance there would be a die-off/replacement of another
> species within the same genus?
> ----- Original Message ----
> From: Matthew Martyniuk <martyniuk@gmail.com>
> Depends on the group. Many modern bird groups have been around for
> that long or longer.