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On the hot topic, this new ref just out:
Jablonski, David and David M. Raup. 1995. Selectivity of End-Cretaceous
bivalve extinctions. Science 268:389-391. 21APRIL95
They look for selectivity in the K-T extinctions and find none. Suggest
big difference in the mechanism behind lesser extinction events and big
mass ones. This is the paper given by the Davids at GSA this year.
Check it out... Ralph Chapman, NMNH