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Re: patterns in extinction, etc.
If there were a nuclear winter, which may have lasted fifty years - cerainly
long enough to devastate many forms of life - would it show up in the
geologic record? If it does show up, how would you find it. What would you
look for? certainly global cooling for fifty years might include severe short
term climatic changes that might not be represented in the geologic record.
Presumable the climate both before and after such a short event would be
very nearly identicle on this time scale. I don't think anyone has suggested
that a catacysmic impact had long term climatic impact - only wide spread -
short time change of significant magnitude - then it was back to business as