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On Fri, Oct 24, 2008 at 1:07 AM, David Marjanovic
>> This comes from the same fossil beds as Pedopenna ("feather foot") and
>> which are now radiometrically dated at 152-168 million years.
> No, no, no.
> Wang Xiaolin, Zhou Zhonghe, He Huaiyu, Jin Fan, Wang Yuanqing, Zhang
> Jiangyong, Wang Yuan, Xu Xing & Zhang Fucheng: Stratigraphy and age of the
> Daohugou Bed in Ningcheng, Inner Mongolia, Chinese Science Bulletin (English
> edition) 50(20), 2369 -- 2376 (October 2005)
> The Tiaojishan Fm, which has the mentioned radiometric date ( = Middle-Late
> Jurassic boundary), underlies the Daohugou Bed, rather than overlying it.
Liu, Y., Liu, Y., and Zhang, H. (2006). "LA-ICPMS zircon U-Pb dating
in the Jurassic Daohugou Beds and correlative strata in Ningcheng of
Inner Mongolia." Acta Geologica Sinica (English Edition), 80(5):
...which found a mid-Late Jurassic age?