Knightia fossil packed in luxury cassette with description. Originating from Wyoming in the U.S.A.

Knightia is an extinct genus of clupeiform bony fish from the family of the herringidae that lived in the freshwater lakes and rivers of North America during the Eocene. The genus was named in 1907 by David Starr Jordan in honour of the late University of Wyoming professor Wilbur Clinton Knight, "an indefatigable student of Rocky Mountain palaeontology". Knightia is the state fossil for Wyoming and the most frequently excavated fossil fish in the world. Fossils include all the remains and traces of plants and animals preserved in rocks. Contrary to popular belief, fossils are not necessarily "petrified"; indeed, many fossils are not petrified. Researchers have found fossil remains that have undergone little change, even in very old rocks. Nor are fossils always ancient; many recent fossils are known, formed during periods within human memory. Palaeontology, the science of fossils, contributes to the study of the succession of rocks, a branch of geology called biostratigraphy. Because the remains of life fossilise only under specific conditions, fossil information is limited and inherently "incomplete". The word "fossil" is often associated with the bones of dinosaurs or mammoths, and indeed, the hard parts of an organism are most likely to be preserved through fossilisation. For vertebrates, these are the bones and especially the teeth. An organism rarely preserves its softer tissues unless a layer quickly covers them to protect them from decay or predation. With only the hard parts, it can be difficult to get a complete picture of the organism. An example of this is the Conodonta, which for a long time were known only from their tooth-like fossils.