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Re: Barringer (Meteor) Crater
Randy:
I located this on the web for you and any others:
----SNIP----
In situ 10Be-26Al exposure ages at Meteor Crater, Arizona
K. Nishizumi, C.P. Kohl, J.R. Arnold, University of California, San Diego
E.M. Shoemaker, USGS, Flagstaff, AZ
J. Klein, D. Fink, R. Middleton, University of Pennsylvania
Geochimica et Cosmochimica Acta 55 (1991) 2699-2703
A new method of dating the surface exposure of rocks from in situ production
of 10Be and 26A1 has been
applied to determine the age of Meteor Crater, Arizona. A lower bound on the
crater age of 49,200 +- 1,700
years has been obtained by this method.
-----SNIP-------
It is not much writing, but it says what method was used bracket the age.
Here is the link:
http://primelab.physics.purdue.edu/web/primelab/papers/NI91a.html
Matt
Randy M. Steiner wrote:
> Howdy list!
>
> This is my first request to all the members:
> Can anyone tell me what the source was for changing the period of
> impact from ~25,000 y.a. to 49,000 y.a.? The period changed in texts
> around 1992 or 1993. Can you list any citations? How about it Ron. . .
> Was there some new geological evidence or what?
> Thanks for any help.
>
> Randy Steiner
> Kingsburg Observatory
--
Matt Morgan
Mile High Meteorites
http://www.mhmeteorites.com
P.O.Box 151293
Lakewood, CO 80215-9293
References: