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Re: what is the best and/or std nomenclature for ...
... post-Permian, pre-KT other than Mesozoic, or is there one?
There isn't.
Or, to be more precise, I guess I'd like a term to describe the period of
the appearance of what is known as "dinosaur" in the mid-Triassic ---> end
of Cretaceous.
There isn't one -- it would overlap the Triassic rather than in- or exclude
all of it, and that's not how it's done.
http://www.stratigraphy.org/gssp.htm