Ailanthus confucii Platycerium, a staghorn fern Salvinia preauriculata, a water fern Lygodium kaulfussi 'climbing fern' Nelumbo spp Chaneya tenuis; a genus of uncertain affinities Birthwort (species unknown) Soapberry Species similar to a walnut Arthropods: Bechleja rostrata, an extinct species of shrimp Procambarus primaevus, an extinct species of crayfish Three unidentified species of spider Dragonflies Damselflies Crickets Other insects including bees and ants Primary source: Gallery See also Dinosaur National Monument, Colorado, Utah List of national monuments of the United States Other NPS Cenozoic Era sites in the western U.S.: John Day Fossil Beds National Monument, Oregon Hagerman Fossil Beds National Monument, Idaho Agate Fossil Beds National Monument, Nebraska Badlands National Park, South Dakota Florissant Fossil Beds National Monument, Colorado References External links National Park Service: official Fossil Butte National Monument website Photo Gallery of Green River Formation Fossils from FBNM Photo tour of FBNM, from USGS Paleontology of Green River fossils, from University of California, Berkeley Geologic travel guide from American Geological Institute National Park Service National Monuments in Wyoming Eocene Fossil parks in the United States Protected areas of Lincoln County, Wyoming Natural history museums in Wyoming Museums in Lincoln County, Wyoming Protected areas established in 1972 Paleontology in Wyoming Paleontological protected areas in the United States 1972 establishments in Wyoming 1972 in paleontology