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Re: A Jurassic 'beaver'
At 10:08 PM +0100 2/23/06, David Marjanovic wrote:
>> And for the dinosaur connection, it comes from the same deposits as
>> Pedopenna, the enigmatic 'feather-foot' theropod.
>Eh, but in this case it is early to middle Early Cretaceous in age, not
>Middle Jurassic. (I sent the ref to the list a few months ago.)
They cite three references for the 164 million year date:
W Chen, Q. Ji, D-Y Liu et al, Geol Bull China 23, 1165 (in Chinese) (2004)
Y-O Liu, Y-X Liu, Geophysical Res Lett 32, L12314, (2005)
Q. Ji et al, Mesozoic Jehol Biota of Western Liaoning China (Geol Publ House,
If my recollection is correct, the second of these is a radiometric date. What
has been questioned is the interpretation of the stratigraphy. I have not seen
the other two references.
Jeff Hecht, science & technology writer
Boston Correspondent: New Scientist magazine
Contributing Editor: Laser Focus World
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