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Re: extinction

As promised, but a little late, I now have the reference on
the persistantly barren zone at the top of the Hell Creek.
[A zone only about 10-15 ft wide, so it would fit in one
sample of the prior study].

        Michael E. Williams, 1994. Catastrophic versus
        noncatastrophic extinction of the dinosaurs: testing
        falsifiability, and the burden of proof.
        Journal of Paleontology, 68(2), pp 183-190

[As the title indicates, it actually covers a good deal
more than just the barreb zone].

swf@elsegundoca.ncr.com         sarima@netcom.com

The peace of God be with you.