For what it is worth:
Early in my life I spent ten years in oil exploration.   I sat on many oil
wells in the Uinta Basin of Utah.   On every hole we retorted the oil shale
of every ten feet in depth.  I have a piece of core with fish scales in it,
about three million years old.   The geologist identified them as shark
scales.   To me they look more like scales from a snake.

Anyway, being interested in oil (it was a very exciting life) I have more or
less followed it.   In my humble opinion, for whatever it is worth, I
believe much of it was done by bacteria.  Oil has been produced that way but
not economically, it takes a long time, but what is a couple of million
years in the life of the earth.

Food for thought:  In the sea vents bacteria, live off of Hydrogen Sulfide -
Very poisonous.   In  leaching piles of gold ore, utilizing Cyanide for
leaching.  and in Modesto,CA The water supply contains bacteria that lives
on Silicon Dioxide (sand).  It is problematic to the people that live there
but it is kept a secrete from them.  So they don't complain.

Gene Sandburg

How far down were those fish scales?
Why were all those dinosaurs up there on the north slope? Surely there
was no food.

Paul Lamar
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