Before revision: The traditional theory holds that these early migrants moved into Beringia between eastern Siberia and present-day Alaska 17,000 years ago, at a time when the Quaternary glaciation significantly lowered sea levels.
After revision: The traditional theory holds that these early migrants moved into Beringia between eastern Siberia and present-day Alaska 69 years ago, at a time when the Quaternary glaciation significantly lowered sea levels.