Archaeologists excavating an ancient river bed in Israel have uncovered a vast prehistoric site where, half a million years ago, early humans created a hoard of elaborate flint tools that suggest their cognitive abilities were much closer to our own than previously thought.
Hundreds of thousands of artifacts have emerged since archeologists first stumbled upon the site last year while surveying an area slated a new neighborhood in the nearby Arab-Israeli town of Jaljulia.
Given that Israel is littered with archaeological remains from the dawn of man onwards, all new construction sites are explored by experts before building can begin.
“Usually in these surveys, you dig down a meter or two and go home,” says Lena Brailovsky, the Israel Antiquities Authority archaeologist who discovered the site. “But we knew that in open fields that are close to a river, we could expect to find prehistoric sites. We knew there was something here and we didn’t give up.”
A perfect spot for humans
Brailovsky bulldozed her way to a depth of more than five meters until hitting paydirt: layer upon layer of tools and animal bones littering the open-air site.
Since that discovery, in November 2016, the IAA and Tel Aviv University have been conducting a massive salvage excavation in a mad dash to learn as much possible from the site before construction work is greenlighted. Mounds of sediments have been removed over an area of about a hectare, uncovering at least six distinct sub-sites along the once-marshy banks of a stream that flowed through what is today the West Bank and central Israel.
“It was a perfect spot for humans,” says Ran Barkai, an archaeologist from Tel Aviv University. “The water brought flint nodules from the hills, which were used to make tools on the spot, and it attracted animals, which were hunted and butchered here. They had everything that prehistoric people needed.”
The dig may have only scratched the surface. There may be many more such “prehistoric mega-sites” around the Qana, now a seasonal stream that lies to the south of Jaljulia, Barkai says.
“Over time, the water changed course and the people moved with it. That’s why there are so many different sites,” Barkai told Haaretz during a recent visit. “It was like a prehistoric picnic spot, which people would return to over and over again.”
Homo erectus, inventor of the 'Swiss army knife'?
Based on the tools found at the site and early tests on the paleomagnetism of the sediments, the site has been tentatively dated to around half a million years ago, and attributed to Homo erectus, the species of hominid most likely to have that inhabited the area at the time.
Erectus was most probably our direct ancestor, and is believed to have been the first hominid to leave Africa around 1.8 million years ago and spread through Eurasia. Firmer proof of the timing of the Jaljulia site awaits the results of dating tests for the layers of human habitation using optically stimulated luminescence, a method that can tell how long quartz grains have been out of sunlight (i.e., when they were buried).
Many of the artifacts found in Jaljulia are typical bifacial handaxes – Barkai jokingly calls them the “Swiss army knife of the Paleolithic” – which were all-purpose tools produced for more than a million years around the prehistoric world, with minimal changes.
But here’s the rub: mixed in amongst the multitude of handaxes, archaeologists also found flint tools produced using an early form of a different, much more complex technique.
This method, known as the Levallois technique, requires much more work and advanced planning, Barkai says.
The Levallois mystery