4 years ago
Around 120,000 years ago in where is now northern Saudi Arabia, a small band of homo sapiens stopped to drink and forage at a shallow lake that was also frequented by camels, buffalo, and elephants bigger than any species seen today.
The people may have hunted the large mammals but they did not stay long, using the watering hole as a waypoint on a longer journey.
This detailed scene was reconstructed by researchers in a new study published in Science Advances on Thursday, following the discovery of ancient human and animal footprints in the Nefud Desert that shed new light on the routes our ancient ancestors took as they spread out of Africa.
Today, the Arabian Peninsula is characterized by vast, arid deserts that would have been inhospitable to early people and the animals they hunted down.
But research over the last decade has shown this wasn't always the case – due to natural climate variation it experienced much greener and more humid conditions in a period known as the last interglacial.
The paper's first author Mathew Stewart, of the Max Planck Institute for Chemical Ecology, Germany, told AFP the footprints were discovered during his PhD field work in 2017 following the erosion of overlying sediments at an ancient lake dubbed "Alathar" (meaning "the trace" in Arabic).
"Footprints are a unique form of fossil evidence in that they provide snapshots in time, typically representing a few hours or days, a resolution we tend not to get from other records," he said.
The prints were dated using a technique called optically stimulated luminescence – blasting light at quartz grains and measuring the amount of energy emitted from them.
