[meteorite-list] New Member - Going Backward

From: Paul Heinrich <lenticulina1_at_meteoritecentral.com>
Date: Thu Apr 22 10:13:09 2004
Message-ID: <20030425005405.21417.qmail_at_web21406.mail.yahoo.com>

On Thu, 24 Apr 2003 13:57:44 -0700 (PDT)
Mark Jackson (??) wrote:

...text deleted...

> For the last couple of months I have been exploring
> in the Colorado Desert of Southern California. I
> believe I have discovered a strewn field of impact
> ejecta that includes nickel-rich graphite nodules,
> nickel fused to target sediment (impact melt), and
> spherules. The target sediment seems to be
> calcareous limestone brecciated with some other
> stuff. Believe it or not, I believe I have
> observed nanodiamonds in some of the impact pieces.

...text deleted....

Some books that provide helpful advice and information

in evaluating stuff like you are finding are:

Koeberl, Christian, 1997, Impact cratering; the
mineralogical and geochemical evidence. In K. S.
Johnson and J. A. Campbell, eds., pp. 30-54, Ames
structure in northwest Oklahoma and similar
features; origin and petroleum production (1995
symposium), circular no. 100, Oklahoma Geological
Survey, University of Oklahoma. Norman, OK.

Montanari, A., and Koeberl, C., 2000, Impact
Stratigraphy: The Italian Record. Lecture Notes
in Earth Sciences, Springer-Verlag, 364 pp.

Montanari and Koeberl (2001) has excellent advice
about recognizing impact ejecta in strewn fields.

The only place that I found all sorts of fused
pieces of nickel-rich stuff, weird breccias, and
other such items was around the edges of the "Impact
Area" in Fort Polk, Vernon Parsih, Louisiana. What
you found sound much more interesting.

It would be interesting to know when you find some
shocked quartz and to see some pictures of
what exactly you are finding.

Yours,

Paul
Baton Rouge, LA


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Received on Thu 24 Apr 2003 08:54:05 PM PDT