Columbian mammoth
The camelop bones and artifacts date back to about 11,000 BC. The site has Colorado's largest collection of Columbian mammoth bones. Pronghorn and rodent remains were also found. After 11,000 BC the climate changed and all of the megafauna except the bison antiquus were extinct. About 7000 or 6500 BC, Paleo-Indians hunted bison and smaller mammals at the spring.