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Located on the Niobrara River in northwestern Nebraska, the Agate Fossil Beds and its surrounding prairie are preserved in a 3,000 acre National Monument. Once part of "Captain" James H. Cook's Agate Springs Ranch, the nearby beds are an important source for 19.2 million year-old Miocene epoch mammal fossils. Cook's ranch also became a gathering place for Chief Red Cloud and other Oglala Lakota (Sioux) Indian people. The monument's Cook Collection of American Indian artifacts reflects years of gifts brought by the Indians during visits to the ranch from the 1880's through the early 1900's.
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