Fossil Cycad National Monument, Paleontological site in Fall River County, South Dakota, United States.
The 320-acre monument contains fossilized remains of cycadeoids within the Black Hills, dating back approximately 120 million years to the Cretaceous period.
President Warren G. Harding designated the area as a national monument in 1922, making it the third national monument specifically created to protect fossil resources.
The site contributed to paleobotanical research through George Reber Wieland's extensive studies, resulting in the publication of American Fossil Cycads by Carnegie Institution.
The monument ceased operations in 1957 due to the depletion of fossils, and the land transferred to the Bureau of Land Management for different purposes.
The discovered cycadeoid specimens revealed previously unknown details about prehistoric plant reproduction structures preserved within their fossilized trunks.
Location: Fall River County
GPS coordinates: 43.39500,-103.72600
Latest update: March 18, 2025 21:21
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