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Re: Archaeoraptor horizon

GSP1954@aol.com wrote:

> 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.

Josh Smith
Department of Earth and Environmental Science
University of Pennsylvania
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