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Image
editWhere'd the great illustration go? —Preceding unsigned comment added by 24.118.61.10 (talk) 05:56, 21 December 2010 (UTC)
Age
editPedopenna daohugouensis (Xu & Zhang 2005) was a small eumaniraptoran dinosaur from the Late Jurassic from the Daohugou beds in China.
- The latest study (He et. al. 2004) places the Daohuhou beds as no earlier than the beginning of the Cretaceous. Too bad, would have been cool if this were pre-Archie. Dinoguy2 00:58, 11 December 2005 (UTC)
Chinese geologists: Daohugou Beds are not post-Middle Jurassic
editGao and Ren (2006) conclude that the Daohugou Beds are Middle Jurassic in age, based on radiometric dating of ignimbrite from Inner Mongolia. They conclude the assertion that the Early Cretaceous age of these rocks proposed by He et. al. (2004) is inaccurate, because there is no evidence to suggest an overturned stratigraphic sequence. Therefore, the suggestion that Pedopenna existed earlier than Archaeopteryx is corroborated.
Gao K. & Ren D.: Radiometric Dating of Ignimbrite from Inner Mongolia Provides no Indication of a Post-Middle Jurassic Age for the Daohugou Beds, Acta Geologica Sinica English Edition 80(1), 42-45. —The preceding unsigned comment was added by 72.194.116.63 (talk) 20:11, 27 December 2006 (UTC).
- This ongoing debate has implications for a wide range of fossils, including the new glising mammal, Jinfengopteryx, Epidendrosaurus, etc. I'd keep in-depth examination of the issue to the Daohugou Beds article. Dinoguy2 00:06, 28 December 2006 (UTC)