What can bison fossils teach us about the original American migrants?

Bison 1An ice-free corridor through the Rocky Mountains once thought to be humanity’s path to the Americas from Alaska did not open in time to be the access route to the Americas, according to researchers who studied fossil samples of bison.
Using radiocarbon dating and DNA analysis, the researchers tracked the movements of bison into the corridor and determined it was fully open about 13,000 years ago, according to a press release from the University of California Santa Barbara, where some of the researchers are based.