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Re: Sweet cynodont Thursday
<<Except that Botha et al. don't mention why they put *Dvinia* deep into
the Late Permian.>>
I'd imagine 'deep' here means 'shallow' in my complex stratigraphic
vocabulary; 'late', 'uppermost', 'near the top' of the Permian.
Er, yes. "Deep into the interior"... :-]
Page 481 also has its attractions. There's a table listing all the
identified terrestrial vertebrates from 16 similarly aged localities in
the immediate area. My scribbled, unchecked numbers are downstairs so the
following corpse count is slightly rough. Over 120 corpses or bits of
corpses have been identified from this /Tropidostoma/ Assemblage Zone
assemblage. 72% of them were contributed by one dicynodont species,
/Diictodon galeops/. A couple of the localities might be accused of bias.
One provided 29 corpses with 22 of that species. Another yield 15 of that
species and a bit of some other dicynodont. Even so, I'm impressed with
this critter. It's been found in 14 of those 16 localities. The next
most numerous taxon comprises of 8 specimens of /Tropidomstoma/, with 5 of
them from a single source.
Yes, the Karroo Permian is incredibly rich. Outside of maybe the Jehol Group
(which hasn't been researched for so long and is probably a bit less easy to
access), I'm not aware of a Mesozoic terrestrial deposit that is comparable,
except for monospecific bonebeds... does Ghost Ranch count? Should the
Morrison Fm count (the biggest dicynodonts in the *Tropidostoma* zone should
have overlapped the smallest Morrison dinosaurs in size, AFAIK)?