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Tetanurae@aol.com wrote:
> Will I ever get off this subject? :-)  Did Ji happen to mention where on the
> Psittacosaur specimens the scales were found?  Also, is there any reason the
> national geographic photos of Sinosauropteryx seem to show that the limestone
> is grey instead of yellow, like every other photo I have ever seen of them?
> Is this just weird lighting techniques or are these things changing color?
        The Yixian sediments are not limestones.  They are siltstones and 
sandstones, with some really really minor, very cool evaporites.  They 
vary in color from brown to yellow to white to grey.

Josh Smith
Department of Geology
University of Pennsylvania
471 Hayden Hall
240 South 33rd Street
Philadelphia, PA  19104-6316
(215) 898-5630 (Office)
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