Diplomystus is one of the more common fish in the 50 million year old Green River Formation of Wyoming. In all practical purposes it is a larger relative to the more common Knightia. Diplomystus averages 3-6 inches from the "split fish" layers in the quarries though the 18 inch layer can yield specimens well over a foot long.
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FOR SALE ONLY

DIPLOMYSTUS FOSSIL FISH FOR SALE

: $39 to $2,395