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Re: Extinction

Those of us that are inclined to believe that an impact was largely
responsable for what happend at the K/T boundary also have to come up
with some good models for exactly what a large impact would do to the
world wide ecosystem to cause a mass extinction.  Would it set off a
chain reaction spreading the effects over thousands or hundreds of
thousands of years?  Or would it be like a giant hammer blow that just
wiped out everything at once?  Maybe some combination.  Do we even know
how far a planetary ecosystem needs to be tipped in order for it to
crash?  Lots of questions, but only rudimentary answers so far. 
|      Michael J. Styzen               Phone: (504) 588-4308            | 
|      Shell Offshore Inc.             Room:  OSS-2920            
|      P.O. Box 61933                  Email: mstyzen@shell.com         | 
|      New Orleans LA  70161                                            |