Ancient footprints in the US have been found to date back to 23,000 years ago, a new study has revealed.
Scientists have been looking at the preserved footprints at White Sands National Park in New Mexico and discovered they go back to the Ice Age.
If the new results hold up, it could bring new scientific debate over when humans first arrived in the Americas.
It was believed humans entered America after the melting of the North American ice sheets due to it opening up migration routes.
However, the footprints reveal a much earlier migration of humans into the Americas.
Professor Vance Holliday of the University of Arizona said: “There has been a lot of debate over many years about the first peopling of the Americas with several early sites identified.
“Few archaeologists see reliable evidence for sites older than about 16,000 years. The White Sands tracks provide a much earlier date.”
The footprints were formed in soft mud around a shallow lake which now forms part of Alkali Flat a large playa at White Sands…