Eocene Green River Bird Feather
Bird Feather with Priscacara
Green River Formation
Middle Eocene
Lincoln County, Wyoming
This specimen is a really good fossilized bird feather from the Green River Formation. The feather has excellent detail. The feather is 5 cm long. Also on the slab is a juvenile Priscacara sp.
Even though the Green River Formation is most well known for its fossil fishes, in terms of biological diversity the Eocene birds that lived around the ancient lake were a more diverse faunal community. There are presently known at least 34 species and 27 families with others still not scientifically described. The fossil birds of the Green River are among the best preserved in the world and the avifauna provides documentation of the early diversification of major lineages after the Late Cretaceous mass extinction.