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Re: Age of formations

      -Does a Late Maastrichtian age for the Nemegt seem likely now, considering that upper Horseshoe Canyon strata extend into Late Maastrichtian time and some Nemegtian taxa, notably T. bataar , suggest an age intermediate between Horseshoe Canyon and Hell Creek? 
Is there an official boundary between Early and Late Maastrichtian (like between Early, Middle and Late Miocene), or are these just relative terms?
Why does T. bataar suggest such an intermediate age?
11. Thou shalt abstain from the use of dodecylsulfate [sic] [a solvent] for dodecylsulfate is the  D E V I L.  Thou shalt remember that man dissolved in dodecylsulfate appeareth as a single peak in the ultracentrifuge.