[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Archaeoraptor horizon
> Is "Archaeoraptor" from the lower Yixian (=Chaomidianzi) Formation?
> Greg Paul
I think it is supposed to be...however, how are we supposed to prove
maybe if we did some Rare-Earth elemental analyses using a Yixian
Formation standard; other than that we do what we always do: speculate.
Yixian. The basis on which the Chaomidianzi Formation was designated
has no validity according to the International Strat Code. It is hard
to argue a new formation out of the bottom of the Yixian when there is
no lithologic change to support it.
Department of Earth and Environmental Science
University of Pennsylvania
471 Hayden Hall
240 South 33rd Street
Philadelphia, PA 19104-6316
(215) 898-5630 (Office)
(215) 898-0964 (FAX)