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Chris, I for one, believe that the impact was
probably the sole cause, due to atmospheric debris blocking photosynthesis for a
matter of months. Not nuclear winter, not acid rain etc. (although this may have
happened to an extent). I believe there was a "pole" taken of
professional paleontoligsts on this matter at the end of the book "Hunting
Dinosaurs" by Louis Psihoyos. Also , if you check back a couple of
months(?) ago,you can see by the long debate on this subject, there were varying
views. You might conduct an accurate poll yourself, by requesting opinions off
list, but I think you`ll find that most will see it as only a contributing
factor in extinction (the K-T anyway).
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