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
Hagerman Fossil Beds is nationally and internationally significant for its world-class paleontological resources. It includes the world’s richest fossil deposits, in quality, quantity, and diversity from the late Pliocene epoch. Many of its fossils represent the last vestiges of species that existed before the last Ice Age, the Pleistocene, and the earliest ‘modern’ flora and fauna.
The Monument’s paleontological resources are contained in a continuous, undisturbed stratigraphic record spanning at least 500,000 years. The fossils deposited here appear to represent an entire paleontological ecosystem with a variety of habitats such as wetland, riparian, and grassland savanna.
The Monument is also one of four National Park system units containing a portion of the Oregon Trail National Historic Trail.