Knightia is an extinct genus of bony fish related to modern day herrings and sardines which lived in North American freshwater lakes and rivers during the Eocene epoch. The specimen came from the Lower Eocene (55 million years old) deposits of the Green River Formation in Wyoming. The fish fossils from the Green River Formation are considered the best preserved fish fossils ever found. During the Eocene, large inland seas covered much of what is now the Western United States. The most well-preserved Eocene fish fossils come from this region. First plate measures 7.75x10x5/16" deep and contains 5-5/8" long Knightia fossil. Plate has incised name of person who prepared this fossil. Second plate measures 8.75x10-7/8x5/8" deep and contains 7.5" long Knightia fossil. Both are wonderfully preserved, w/individual vertebrae visible as well as well-defined tail and fins on both specimens. Both have painted stock numbers on reverse along w/sticker from fossil gallery listing specifics about Knightia. Wonderful display. From the Robert M. Overstreet Collection and comes with COA.