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Yixian Dates

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.  

Josh Smith
University of Pennsylvania
Department of Earth and Environmental Science
471 Hayden Hall
240 South 33rd Street
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