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Beaverhead
- To: meteorite-list@meteoritecentral.com
- Subject: Beaverhead
- From: shattercone@videotron.ca
- Date: Wed, 29 Sep 1999 20:46:09 -0500
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- Resent-Date: Wed, 29 Sep 1999 21:12:47 -0400 (EDT)
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Hello Leonard, Bernd and list,
In fact the crater is 60km in diameter but from what I can understand from
Jarmo Moilanen web site it says and I quote: "Now 15km in diameter". So
maybe the actual crater is 60km but maybe by what is left of the crater is
15km????? I don't really know, I never visited that crater.
Can somebody answer this for me!
PS Those interested in shattercones, I have over 10kilos of Charlevoix
shattercones for sale or trade!
Gaetan
>Gaetan wrote/a écrit:
>
>> Diameter: 15km
>
>Hello Leonard, Gaetan and List,
>
>Slight correction concerning its d i a m e t e r, unless it has been
>updated:
>
>R.B. Hargraves, P.P. Christiansen, C.E. Cullicott, K.S. Deffeyes,
>P.S.Fiske and S. Hougen, 1990, Shattercones and Shocked Rocks in SW
>Montana: The Beaverhead Impact Structure, Geology 18, 832-834:
>
>Estimated diameter is 60 km. Recently discovered shatter cones in
>Paleozoic Belt rocks are spread over a 15 x 8 km area in SW Montana.
>These same shatter cones were noted but not recognized as early as
>1966 (B.K. Lucchitta, 1966, Ph.D. Diss. Penn. State Univ.).
>
>C. Koeberl et al. (1991)Beaverhead Impact Structure - Geochemistry of
>Impactites and Country Rock Samples (abs. in Meteoritics, 1991, vol. 26,
>no. 4, p. 358):
>
>The shatter cones point steeply upward and are abundant in sandstones of
>the Belt Supergroup, covering an area of about > 100 km^2.
>
>
>Can I now have a shattercone too, please? :-)
>Best wishes and happy hunting,
>
>Bernd
>
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Two-Mountain Meteorites & Impact materials
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