Yixian Dates

[smithjb@sas.upenn.edu (Joshua Smith)]

OK.  So I am off to the north pole to hunt for Eocene ectotherms for five 
weeks, so I am going to miss the discussions concerning the Swisher et 
al. paper that will come out in _Nature_ next week on Cretaceous Ar/Ar 
dates of the Sihetun quarries in Liaoning.  So, if I don't comment, that 
is the reason.  



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