The site at the new Fossil Creek Park also had bones from birds, rodents and other animals that are at least 30,000-years-old.
After the discovery, the city contacted Colorado State University anthropology professor Larry Todd, who brought in students to excavate the bones. The class worked through September and into mid-October.
The Fossil Creek site was a floodplain, with buried deposits from the Rocky Mountains' glacial outwash during the Ice Ages.
Sediment accumulated rapidly, eventually burying the bones under 15 feet of soil.
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