Fossil Fish Multiple Plates

This is a 50 Million year old Fossil Fish Multiple Plate from the Green River Formation in Kemmerer, Wyoming.  These fish are both Genus Knightia and this specimen is very interesting as one fish was preserved on the other.  These Multiple plates are very scarce and a must for every fossil collection. The lower fish would measure approx 3" long and the upper fish is approx 3-1/2" long with the entire specimen measuring 4-3/4" x 3-3/4".