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Re: 1400Ma old meteorite layer?
Joseph kindly wrote:
"While sorting thru the sand for nanofossils of conodont jaws and placoderm
teeth (again using Mike Blood's Russian stereoscope!), I’ve come across several
perfectly spherical jet black grains with visible pitting and flow lines very
reminiscent of Indochinites."
Hello Joseph and All,
The joy of looking for conodont jaws is one everyone should experience.
However, when looking at other objects in the "conodont sand," it is important to
remember how the soil was prepared. Depending on the source, it may have been
physically pulverized, and/or dissolved in a chemical solvent. I've used Coleman
brand white gas to dissolve conodont laden rock from Iowa.
My point here is that the material is not pristine so viewing objects and
suspecting
microtektites must be cautiously interpreted since preparation of the material
may
have created the observed feature in the first place.
On the other hand, the preparation of the material may have, in fact, opened the
door to some new features that otherwise would not have been separated from the
matrix and observed through usual methods.
All very exciting!
Sincerely,
Martin
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