Nature & Science
Known mostly for its fossils from the late Pliocene epoch it contains one of the world’s richest known deposits of fossil horses, Equus simplicidens, thought to be a link between prehistoric and modern horses.
In 1988, the Hagerman horse became
An artist rendition of the ecosystem when the Hagerman Fossil Beds were deposited during the Pliocene Epoch. A fluvial (river) and floodplain environment around the edge of ancient Lake Idaho deposited layers of sand, silt and clay at least 600 feet thick. Layers of sediments have preserved an exquisite world class assemblage of Pliocene fossils.
Visit the Animals page to learn more about the variety of species that inhabited the area during the Pliocene Epoch.
Did You Know?
An in situ specimen of Clemmys owyheensis (pond turtle) was found out in the Monument. The field crew also found a jaw with several teeth from Thomomys gidleyi (pocket gopher) and a jaw from Trigonictis idahoensis (grison from the weasel family).