[meteorite-list] New or maybe old QUESTION??????

From: STARSANDSCOPES at aol.com <STARSANDSCOPES_at_meteoritecentral.com>
Date: Sun, 4 May 2008 09:57:40 EDT
Message-ID: <cc4.2f0279dd.354f1ad4_at_aol.com>

Hi Pete, IF you are looking for an affordable sample check out Al Hagounia.
 It matches your criteria and it is an Enstatite. NAU recently posted a
paper on their web site that nicely covers what it is, the terrestrial
alteration it has undergone, and it's location in the layers of sediment.
http://www4.nau.edu/meteorite/Meteorite/Al_Haggounia.html

The stuff is ugly on the outside but I have cut quite a few slices and it is
interesting when cut. It takes a polish quite nicely. When you happen to
cut into a large radial chondrule it is beautiful. A sea of fine grain brown
with only one big fan shaped chondrule. Those polished examples make a nice
display. Some times you get a "Blue" one! The Blue phase, NWA 2828 is an
example, can be found mixed with the brown in the same slice. That is not
common so it is fun when you find one. The best part is it is cheap because
there is plenty to go around.

Tom Phillips

In a message dated 5/4/2008 1:09:56 A.M. Central Daylight Time,
pshugar at clearwire.net writes:
List,
Maybe this has been asked and answered (sounds like a lawer thing) and maybe
not.
Since I am relatively new to collecting and certainly not an Expert in any
area of meteorite study (with the exception of magnetisum (from the sky
magnetic VS made a magnet by processes here on earth).
Here's my question:
A geologist digs in an area that he thinks there will be the likelyhood of
finding a fossil. Maybe he gets lucky and maybe finds bunches of them.
Has anyone ever found a meteorite buried deep in a layer that is thousands
or even millions of years old?
Years ago--long before I became an obsessed, crazed, meteorite addict,
while teaching a series on earthquakes, I had found a video of a scientist
standing with one foot on the Pacific plate and the other foot on the North
Americian plate, ie astraddle of the San Andreas fault line. In back of him
was a small vertical clift of maybe 10 feet and you could plainly see the
shift (approx 15 inches) in the layers of sediment.
Now I've got to thinking (some say this is my problem--Thinking) that these
meteorites have a tremendous terestial age. If the earth is bombarded by
these meteorites throughout the aeons, then there should be a record, ie
evidence in the form of buried craters (see the Odessa,Tx crater) -- Approx
100 to 110 feet deep that has been filled in till it is only 25 to 30 feet
deep now due to wind blown sand (mostly). I've got a pamplet of "Occasional
Papers of the Strecker Museum" from Baylor University showing a neat cross
section of the Odessa Crater.
How much investigation into the cross section structure of the sediment
layers, looking for evidence of craters has been done? Has there ever been
an accidential discovery of a buried crater in a clift side. Lots of these
erroded mesa exist out west. Maybe evidence is visable there.
Surely Valeria is not the only animal killer out there.
Maybe another animal drilled by a passing meteorite with the coresponding
meteorite near the body. Maybe there's no body but the meteorite is still
there buried in the deeper layers of sediment. Maybe tektites are the only
surviving evidence.
In a nutshell, has there ever been a meteorite found at a depth of sediment
that is plainly very old?
Pete

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Received on Sun 04 May 2008 09:57:40 AM PDT