Wyoming Fish Fossil - Knightia Alta. 5 inches by 3 inches with cut sides and flat bottom that allows it to stand up while displayed.
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Wyoming Fossil Lake is a 50-million year old lake bed is one of the richest fossil localities in the world. Recorded in limestone are dynamic and complete paleoecosystems that spanned two million years. Preservation is so complete that it allows for detailed study of climate change and its effects on biological communities.
During the Eocene, based on the fossil record, the region was sub-tropical to temperate. Some 60 vertebrate taxa have been described from the formation, as well as abundant invertebrates and plants. Green river has been noted for its well-preserved fish since mid-way through the 19th century. The unusually excellent preservation of the Green River fish fossils is usually attributed to a combination of two factors a cold period during the Eocene that would have caused dead fish to sink faster due to a less inflated swim bladder and the great depth of the lakes and the consequent anoxic conditions that would have often prevented scavengers from disturbing the carcasses.