Chris L Peterson wrote:
It remains to be seen if there actually are widely spread spherules that
can be linked chemically and temporally to a single event. It is
possible there was a North American impact 12,000 years ago, but
_currently_ the evidence is weak. At this point, those interested in
this possibility should be out collecting evidence, not writing books
trying to explain the extinction of mammoths. Too many conclusions are
being drawn from far too little evidence. IMO that's not good science.

You make a good point there about more data. But I don't think a
popular book is necessarily a bad thing in itself. After all, a lot of
good scientists have found the time to write them.

Speaking of books (and Geology) I'm mostly through "Supercontinent" by
Ted Neild. It's a pretty good read. In addition to what appears to be
a thorough telling of an interesting scientific history, he is unusually
eloquent about the process of science in general.

Greg

--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)

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