See Also: Agate Fossil Beds National Monument(encyclopedia)
John Day Fossil Beds National Monument(encyclopedia)
Lava Beds National Monument(encyclopedia)
national monument(dictionary)
national monument(encyclopedia)
El Malpais National Monument(encyclopedia)
Dinosaur National Monument(encyclopedia)
El Morro National Monument(encyclopedia)
Wupatki National Monument(encyclopedia)
Colorado National Monument(encyclopedia)

Agate Fossil Beds National Monument (sh)




Natural "depository" of an extinct animal community on the Niobrara River, northwestern Nebraska, U.S. The beds, laid down as sedimentary deposits 20 million years ago, bear the remains of prehistoric mammals.

Discovered งใ 1878, the site was named for its proximity to rock formations containing agates. A national monument since 1965, it covers 2,269 acres (918 hectares).