[meteorite-list] Fossil Meteorites

[E.J]

If memory serves, the petography of the Swedish  fossil meteorites 
(Thorsberg/Kinnekulle) (480mya) was altered/ replaced (chemically).  
Most of their original chemistry is gone, being  true fossils,  their 
physical form was retained.  Someone  noted here that while the 
meteorites had been largely replaced by calcite and barite, traces of 
chromite and iridium were found within.  Bernd has posted the studies on 
this once before (1999?).  I wonder if chondrities were found else small 
blebs of serpentine.

Lake Murray, Oklahoma, US-- at 150 million years, is the meteorite with 
oldest known terrestrial age. It was found in situ in limestone where it 
landed.  A large portion of it is meteoric shale however the core is 
still bears a remarkable amount of metal and preserved Widmanstatten 
features. The T-age is consistent with the age of the strata, I believe.

Someone mentioned Hoba,  it is resting in limestone bedrock within the 
pit it excavated upon landing.

In my days on Ebay before I was this poor even, there was an auction for 
an apparent fossil meteorite impact channel and all-- in cross section 
(offered but failed to meet reserve).  The 2-3 inch wide nugget was at 
the bottom of an apparent 10-8 inch long impact channel made while the 
very fine ooze was still mucky.  The cavity had several "heart-valve" 
appearing "trap doors".  They looked like partial refilling of the ooze 
after the meteorite had passed.  The owner never relisted it and the 
where abouts are unknown.  The 3-D exposure  was far more dynamic than 
the any simulation ever has been.

In one of my many  idle projects, I have two specimens recovered from 
the Eastern PA anthracite field which have some halmarks of  a 
meteorite.  They are stored away awaiting some researcher taking them 
on. (hint, hint)

Regards,
Elton
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