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Re: Campanian genera longevity

There's a chart on Wikipedia showing longevity of *species* in the
Dinosaur Park Formation based on Arbour et al. 2009 and Evans et al.



On Thu, Aug 30, 2012 at 6:08 PM, David Marjanovic
<david.marjanovic@gmx.at> wrote:
> Rescued from truncation:
>> Surfing the internet I recently  found a scale-bar chart illustrating
>> = Dinosaur genera longevity during the Campanian, but forgot to
>> download = it. Can anyone here help me find it again? IF I remember
>> correctly some = or all of the scale bars were coloured blue and
>> genera such as = Chasmosaurus, Styracosaurus, Hypacrosaurus,
>> Corythosaurus, Lambeosaurus, = Daspletosaurus and Gorgosaurus were
>> included.
>> Hopefully, Spike.
> I recommend not even trying to find it again. There is no definition for
> "genus" other than "whatever any given author feels like at the moment".
> Genera are not countable or otherwise comparable. There can't be much
> actual, objective information in that chart.