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dino extinctions and meteorites

 The reference to the Late Cretaceous sediments found *intact* within
the boundaries of the Chicxulub "crater" is from Geology, 1/94.

 Meyerhoff, A.A., J.B. Lyons and C.B. Officer, 1994, Chicxulub
Structure: A Volcanic Sequence of Late Cretaceous Age, Geology, v.22,
p. 3-4.  

 This argument was also presented at the GSA meeting in Boston, October


      Brian J. O'Neill                    Phone:  (504) 588-4351
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