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Re: Everything you know about the Iren Dabasu age is wrong...
--- Phil Bigelow <email@example.com> wrote:
> On Sun, 25 Sep 2005 02:45:42 -0700 (PDT) Tim Donovan
> > No. If Mesolanistes is found from North America
> > the way to southern China (I presume Shuvalov
> > the Maastrichtian Pinging formation)it should be
> > present between these regions,
> It doesn't have to be present in the areas between
> the localities.
> Different paleoenvironmental conditions can create
> huge geographic gaps
> in the range of snails.
Naturally I assume it was absent in the desert areas
but as I wrote before, the paleoenvironment of Iren
Dabasu was similar.
> > and it is known from
> > the Nemegt. If Iren Dabasu
> > were really of Nemegtian
> > age, Mesolanistes should be
> > present there too(the
> > paleoenvironments were
> > similar).
> Paleo drainage patterns may have limited the spread
> of Mesolanistes into
> new areas.
It spread much farther south into China, and farther
inland into Outer Mongolia.
> Besides, it is probably unwise to base
> such sweeping
> generalizations on the occurrence or absence of one
Not just one.
> What does the palynology of these localities
The palynological record of Mongolia is very poor.
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