Here’s what you’ll learn when you read this story:
- Fossilized footprints in Saudi Arabia show human movement just before an incoming ice age.
- Much like carbon dating, scientists rely on isotopes and surrounding context to estimate how old fossils actually are.
- These human prints appeared alongside animal tracks — but with no signs of hunting, suggesting the visitors were simply looking for water.
A remarkably well-preserved prehistoric mudhole may contain the oldest human footprints ever recorded on the Arabian Peninsula. Seven distinct impressions, buried among hundreds of ancient animal tracks, have been dated back roughly 115,000 years.
Discoveries like this one often come from situations where nature does the digging. This particular lakebed sits deep within northern Saudi Arabia’s Nefud Desert, at a site locals call “the trace.” Archaeologists came across it in 2017 after wind and time gradually stripped away the layers of sediment sitting on top. It doesn’t take much imagination to picture this muddy lakebed as a busy crossroads for life in the Arabian Peninsula more than 100,000 years ago.
When those ancient populations moved on, their footprints stayed behind — eventually buried under fresh layers of earth. A similar preservation story played out during the far older Burgess Shale event, where some of the earliest known organisms were found perfectly intact, likely flash-frozen in a sudden mudslide. Even a complete armored nodosaur was discovered in extraordinary condition, sealed in mud on the cold ocean floor. If archaeology handed out awards, mud would be collecting most of them.
In their published research, the scientists explored exactly what made that ancient mud so extraordinary:
“An experimental study of modern human footprints in mud flats found that fine details were lost within 2 days and prints were rendered unrecognizable within four, and similar observations have been made for other non-hominin mammal tracks.”
This means the footprints survived because the conditions were exceptionally specific — and those same conditions act like a timestamp, tying all the prints to the same narrow window of time. From there, the researchers turned to identifying who left them. Homo sapiens weren’t the only upright primates walking the earth back then, but the available evidence points squarely at us:
“Seven hominin footprints were confidently identified, and given the fossil and archeological evidence for the spread of H. sapiens into the Levant and Arabia during [the era 130,000 to 80,000 years ago] and absence of Homo neanderthalensis from the Levant at that time, we argue that H. sapiens was responsible for the tracks at Alathar. In addition, the size of the Alathar footprints is more consistent with those of early H. sapiens than H. neanderthalensis.”
The lake at Alathar was likely one stop along a vast prehistoric migration route — a natural corridor dotted with freshwater sources that drew animals and humans alike as they followed shifting climates. Notably, researchers found almost none of the usual signs of human activity, like cut marks on bones from hunting or butchering.
“The lack of archaeological evidence suggests that the Alathar lake was only briefly visited by people. These findings indicate that transient lakeshore use by humans during a dry period of the last interglacial was likely primarily tied to the need for potable water.”
These particular Homo sapiens may have been among the last to pass through a region that was slowly turning hostile as an ice age closed in. That timing could also explain why no later group walked over their tracks — a fresh blanket of sediment sealed everything in place before anyone else came through.
