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Re: New Papers for Schmucks



Who are you calling a schmuck?  Unless that's a duck and a schmack relationship 
that would call Carl Rove to question.
 
On Oct 10, 2010, at 6:50 PM, Dann Pigdon wrote:

> Brusatte, NiedŸwiedzki & Butler 2010 "Footprints pull origin and 
> diversification of dinosaur stem 
> lineage deep into Early Triassic". Proceedings of the Royal Society B
> 
> Abstract:
> 
> The ascent of dinosaurs in the Triassic is an exemplary evolutionary 
> radiation, but the earliest 
> phase of dinosaur history remains poorly understood. Body fossils of close 
> dinosaur relatives are 
> rare, but indicate that the dinosaur stem lineage (Dinosauromorpha) 
> originated by the latest 
> Anisian (ca 242–244 Ma). Here, we report footprints from the Early–Middle 
> Triassic of Poland, 
> stratigraphically well constrained and identified using a conservative 
> synapomorphy-based 
> approach, which shifts the origin of the dinosaur stem lineage back to the 
> Early Olenekian (ca 249–
> 251 Ma), approximately 5–9 Myr earlier than indicated by body fossils, 
> earlier than demonstrated 
> by previous footprint records, and just a few million years after the 
> Permian/Triassic mass 
> extinction (252.3 Ma). Dinosauromorph tracks are rare in all Polish 
> assemblages, suggesting that 
> these animals were minor faunal components. The oldest tracks are 
> quadrupedal, a morphology 
> uncommon among the earliest dinosauromorph body fossils, but bipedality and 
> moderately large 
> body size had arisen by the Early Anisian (ca 246 Ma). Integrating trace 
> fossils and body fossils 
> demonstrates that the rise of dinosaurs was a drawn-out affair, perhaps 
> initiated during recovery 
> from the Permo-Triassic extinction. 
> 
> http://rspb.royalsocietypublishing.org/content/early/2010/10/06/rspb.2010.1746
> 
> The paper itself isn't free, but the supplemental info is extensive.
> 
> -- 
> _____________________________________________________________
> 
> Dann Pigdon
> Spatial Data Analyst               Australian Dinosaurs
> Melbourne, Australia               http://home.alphalink.com.au/~dannj
> _____________________________________________________________
> 

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