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Re: Extinctions and Impacts?
Good statement Lou. I also believe it is unwise to assume that impacts caused
all mass-extinctions. Being involved in impact crater research, I usually look
for signs of biological disruption, and in most cases we find localized
extinctions that do not correlate globally. There are many other causes for
extinctions, such as volcanic eruption (voluminous flood basalts have an amazing
correlation to a few mass-extinctions, as do impacts), glacial episodes, plate
movement, eustacy...you get the point. It would be silly to assume impacts are
always harbingers of death...
--
Matt Morgan
Mile High Meteorites
http://www.mhmeteorites.com
P.O.Box 151293
Lakewood, CO 80215-9293
"For a geologist, life is a field trip"
Louis Varricchio wrote:
> A puzzle that makes me strongly doubt the common belief that all mass
> extinctions are associated with impactors: If tektites are linked to large
> impacts--and hence and extinctions--it is more than ironic that the
> 700,000+- year old Australasian tektite event, the largest tektite strewn
> field on this planet, has neither an impact crater NOR a mass extinction
> associated with it! In fact, I believe "Java Man" was living at the time
> and it certainly didn't wipe out humanity and a majority of the major animal
> species alive today.
>
> Lou
>
> Louis Varricchio
> Environmental Information Specialist/Research Associate
> Upper Midwest Aerospace Consortium
> University of North Dakota
> Grand Forks, N.D. 58202-9007 U.S.A.
> Telephone: 701-777-2482
> E-mail (in N.D.): varricch@umac.org
> E-mail (in Vt.): morbius@together.net
>
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