Wyoming Jones, Dave Freeman at the excellent fossil display. All of
the fish in this case have been timely cleaned with the air abrasives.

Note the large Paddlefish has other fish fossilized on the same
plate. Note also that in the stomach of the paddlefish is a knightia
that has been preserved. The air abrasive costs more to prepare the
fish but the end result is amazing. The sediments of the ancient lake
are volcanic ash from the Yellowstone area, and Idaho. At one time this
layer was a mile thick. Silica found in the ash deposits helped preserve
the fish as did the anarobic environment at the bottom of the lake
where the fish settled.

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Fossil Fish Digging in Wyoming