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Date for the base of the Hell Creek Formation



In Schweitzer et al.'s (2005) paper on the confirmation of medulatry bone
in __T. rex_, they stated that the material had been collected near the
base of the Hell Creek Formation, which they said was "~70 ma".

How was this estimate arrived at?
Does anyone have recent refs. on the age of the base of the Hell Creek
Formation?


<pb>
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