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Guanlong necks in the Xinjiang deposits?

Have the neck bones of Guanlong fossils in the [Upper Jurassic] Xinjiang 
deposits proven to be more likely to be missing or broken, than either other 
tyrannosaurids, or other dinosaurs of their size bracket?

(reason: I've been reading about the fossils lately - the BBC's book 'Planet 
Dinosaur' - and it when I tried visualizing what it was describing...(the 
sauropod footfall-made pits filling with sediments and little critters, then 
relatively bigger things falling in)...the necks were the primary question mark 
for my mind's eye...which led to that question)
> Date: Wed, 27 Mar 2013 20:12:56 -0700
> To: dinosaur@usc.edu