Agate Fossil Beds National Monument

Agate Fossil Beds National Monument
An aerial photo of University and Carnegie hills
University and Carnegie Hills fossil beds
A map of the United State showing the location of Agate Fossil Beds National Monument
A map of the United State showing the location of Agate Fossil Beds National Monument
A map of the United State showing the location of Agate Fossil Beds National Monument
A map of the United State showing the location of Agate Fossil Beds National Monument
Interactive map of Agate Fossil Beds National Monument
LocationSioux County, Nebraska, United States
Nearest cityHarrison, NE
Coordinates42°25′18″N 103°45′14″W / 42.421703°N 103.75388°W / 42.421703; -103.75388[1]
Area3,057.87 acres (12.3748 km2)[2]
EstablishedJune 14, 1997
Visitors16,827 (in 2025)[3]
Governing bodyNational Park Service
WebsiteAgate Fossil Beds National Monument

Agate Fossil Beds National Monument is a U.S. National Monument near Harrison, Nebraska. The main features of the monument are a valley of the Niobrara River and the fossils found on Carnegie Hill and University Hill.

The area largely consists of grass-covered plains. Plants on the site include prairie sandreed, blue grama, little bluestem and needle and thread grass, and the wildflowers lupin, spiderwort, western wallflower and sunflowers.

History

Entrance to the monument
Map of Agate Fossil Beds

Most of the land that is now the National Monument was part of the Agate Springs Ranch, a working cattle ranch, owned by James and Kate Cook, who bought the ranch in 1887.[4] In 1892, Erwin H. Barbour of the University of Nebraska was the first scientist to examine artifacts at the site. In 1904, Olaf Peterson of the Carnegie Museum in Pittsburgh was the first paleontologist to do extensive excavations. Between 1904 and 1923 there was spirited competition between groups of paleontologists from The American Museum of Natural History, Yale University, and other institutions. The findings were especially significant because they contained full skeletons of extinct Miocene mammals, species previously only known through fragments.[5]

There are several theories as to why such a rich trove of fossils is found at this location. One is that a drought may have brought a large number of herd animals together near sparse water sources, where they died in proximity to each other.[6] Another is that animal carcasses were swept down the ancient rivers and deposited there due to the particular geometry of the river bends and eddies. Another is that animals became trapped in quicksand there.[7]

The monument's museum collection also contains more than 500 artifacts from the Cook Collection of Plains Indians artifacts.

The national monument was authorized on June 5, 1965, but was not established until June 14, 1997. The Harold J. Cook Homestead (Bone Cabin Complex) was listed on the National Register of Historic Places in 1977.[8] Agate Fossil Beds is maintained by the National Park Service.[5]

Paleontology

The site is best known for a large number of well-preserved Miocene fossils, many of which were found at dig sites on Carnegie and University Hills. Fossils from the Harrison Formation and Anderson Ranch Formation, which date to the Arikareean in the North American land mammal classification, about 20 to 16.3 million years ago, are among some of the best specimens of Miocene mammals.[9]

Species found in Agate include:

  • "Devil's corkscrews", Miocene-age burrows of Palaeocastor, discovered in the late 19th century
    "Devil's corkscrews", Miocene-age burrows of Palaeocastor, discovered in the late 19th century
  • The Bone Cabin, used during twenty-five years of fossil excavations at the Agate Fossil Beds
    The Bone Cabin, used during twenty-five years of fossil excavations at the Agate Fossil Beds
  • The Niobrara River flowing through Agate Fossil Beds
    The Niobrara River flowing through Agate Fossil Beds
  • A Daemonelix corkscrew fossil exhibit
    A Daemonelix corkscrew fossil exhibit
  • View of the park from the Daemonelix Trail
    View of the park from the Daemonelix Trail
  • Plains Indian pictographs on a hide at the Agate Visitor Center
    Plains Indian pictographs on a hide at the Agate Visitor Center

See also

References

  1. ^ "Agate Fossil Beds National Monument". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved November 18, 2013.
  2. ^ "Listing of acreage – December 31, 2011" (XLSX). Land Resource Division, National Park Service. Retrieved March 18, 2012. (National Park Service Acreage Reports)
  3. ^ "NPS Annual Recreation Visits Report". National Park Service. Retrieved March 23, 2026.
  4. ^ a b "Mammal Fossils". Agate Fossil Beds. National Park Service. Retrieved January 10, 2022.
  5. ^ a b "Agate Fossil Beds National Monument". U.S. National Park Service. Archived from the original on December 2, 2009. Retrieved December 16, 2009.
  6. ^ "Agate Fossil Beds National Monument". National Parks Conservation Association. Retrieved April 19, 2026.
  7. ^ "Agate Fossil Beds National Monument, Hearing Before the Subcommittee on Public Lands" (PDF). United States Government. August 28, 1964. Retrieved April 19, 2026.
  8. ^ "Nebraska National Register Sites in Sioux County". Nebraska State Historical Society. Archived from the original on October 19, 2013. Retrieved October 18, 2013.
  9. ^ Graham, John Paul. Agate Fossil Beds National Monument: geologic resources inventory report. OCLC 1127651017.
  10. ^ "Unexpected Treasures on Nebraska's High Plains: Agate Fossil Beds National Monument". www.nationalparkstraveler.org. Retrieved January 17, 2022.
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