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Hagerman Fossil Beds National Monument

Hagerman Fossil Beds National Monument near Hagerman, Idaho, contains the largest concentration of Hagerman Horse fossils in North America. The fossil horses for which the Monument is famous have been found in only one locale in the northern portion of the Monument called the Hagerman Horse Quarry. The 4,351-acre (17.6 km2) Monument is internationally significant because it protects the world's richest known fossil deposits from a time period called the late Pliocene epoch, 3.5 million years ago.