Prehistoric fingerprint found in Spain offers clue to Neanderthal capacity for making art, study finds
The pebble marked with the print, found in the San Lázaro rock shelter in Segovia, hints at the possible capacity of Neanderthals to create symbolic art, according to a new study. The discovery adds to a growing body of evidence, including cave markings and paintings unearthed in recent years, building the case that our prehistoric relatives who went extinct about 40,000 years ago were more like modern humans than some might think.
The team of Spanish researchers spotted the oblong rock below 5 feet (1.5 meters) of sediment during an excavation in July 2022 and reported their findings in a paper published May 24 in the journal Archaeological and Anthropological Sciences. San Lázaro is a site believed to have been occupied by Neanderthals, according to the study.
'When we saw (the pebble) the first time … we were looking at the stone, all the team and students, and we were like 'Uh, it looks like a face,'' said study coauthor María de Andrés Herrero, a professor of prehistory at the Compultense University of Madrid. This kind of finding in a Neanderthal context was unexpected, she added.
Herrero said she and her team carbon-dated the fingerprint, and they are certain it dates back about 43,000 years. The rock had been found near a riverbed and deliberately brought to the rock shelter, the researchers believe. Unlike other artifacts found in the shelter, this pebble was unique: It appeared to have no functional use and had a peculiar red dot that intrigued the researchers.
'We felt that the red dot had something, I don't know what … and the only way we could know there was a fingerprint was to contact the main specialist in Spain (for) finding fingerprints,' Herrero said. 'That's why we contacted the police.'
With the help of experts working in crime scene investigations with Madrid's forensic police corps Madrid, the researchers were able to confirm that a fingerprint existed within the dot.
But the police were initially skeptical about the find. 'They are used to identifying fingerprints that are very recent, from 2 days, 1 week, 1 month. But 43,000 years ago — it was very weird and very difficult for them,' Herrero said.
Using forensic techniques and multispectral analysis (an advanced method of capturing images), the investigative experts and the study team were able to discern a fingerprint within the red dot. 'We couldn't believe it really,' Herrero said. The forensic investigator created a special camera to capture the evidence, and it was the first time such techniques were used to identify a Neanderthal fingerprint, according to Herrero.
The imaging technology section of the forensic team then analyzed the marking to confirm it was compatible with a human fingerprint — and to make sure it didn't belong to any of the researchers. The police unit was able to verify that it likely belonged to an adult male Neanderthal.
'The verification of the fingerprint by forensic experts shows beyond doubt that this derived from direct contact with a human fingerprint,' said Paul Pettitt, a professor of paleolithic archaeology at Durham University in the United Kingdom.
The artifact could be the oldest complete hominin fingerprint ever found, according to Herrero. Another, possibly older print was found in Königsaue, Germany, back in 1963 — but that one is a partial fingerprint.
The San Lázaro fingerprint could also be the oldest associated with a pigment, according to the study. The researchers were able to confirm that ocher, a clay pigment, was applied to the tip of the finger that made its mark on the quartz-rich granite pebble.
Statistical modeling used by the researchers showed that the mark on the pebble was 'not random' and rather, intentionally placed, Herrero said.
Pettitt said he was unsurprised by the findings.
'It represents yet another example of the emerging data that are revealing Neanderthal visual culture,' he explained. 'This is an admirably clear and unequivocal example of the Neanderthal use of red pigment, one of a growing database that reveals that Neanderthals were routinely using pigments to leave marks of their bodies (hands, fingertips) on cave walls and portable objects.'
One theory is that the hollows on the rock resemble parts of a face: eyes, mouth and chin. The placement of the red dot, the researchers hypothesized, could be the place of a nose. If that is the case, the pebble marking would constitute a visual sign with a symbolic purpose.
'A meaning or message exists, however simple the object and action may appear, 'the study authors wrote. They added there is reason to suspect that the pebble was intended to be a representation of a face.
The study, which called the characteristics of the pebble 'exceptional,' suggests it might be a visual symbol that could be considered a piece of 'portable art in some contexts.'
If that's the case, scientists' understanding of what Neanderthals were capable of could continue to shift. 'The fact that the pebble was selected because of its appearance and then marked with ocher shows that there was a human mind capable of symbolizing, imagining, idealizing and projecting his or her thoughts on an object,' the study authors wrote.
Though there is no way of knowing for certain, Herrero thinks it's a demonstration of how our understanding of the 'thin line' separating Neanderthals from modern humans is getting thinner. 'They were able to recognize faces in objects, as you and me are able to recognize a lion in the clouds,' she said.
Pettitt offered a similar outlook, saying the findings fit with 'emerging evidence that the Neanderthal imagination was experimenting with the human form and with recognition and extension of that form within and onto objects in their natural world.'
Herrero said the research team is now planning to search for more 'invisible artifacts' to help interpret the past. The forensic police will play a role in finding information not visible to the naked eye.
'We have to collaborate and integrate forensic technologies in archaeology, and maybe archaeology in forensic technologies,' she explained, saying the collaboration is 'opening a new window to check our past.'
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A variety of preserved fossils have been found there as well as some of the earliest stone tools, Reed said. The Afar region is an active rifting environment — the tectonic plates beneath its earth are actively pulling apart and exposing older layers of sediment that shed light on almost 5 million years of evolution, Reed said. 'The continent is quite literally unzipping there, which creates a lot of volcanism and tectonics,' said study coauthor Christopher Campisano, associate director and associate professor at the Institute of Human Origins and associate professor at the School of Human Evolution and Social Change at Arizona State, in a video the school released. 'At 2 1⁄2, 3 million years ago, these volcanoes spewed out ash that contain crystals called feldspars that allow us to date the eruptions that were happening on the landscape when they're deposited.' The Australopithecus teeth documented in the new study were dated to 2.63 million years ago, while the Homo teeth are from 2.59 million and 2.78 million years ago. But the team is cautious about identifying a species for any of the teeth until it has more data and more fossils. 'We know what the teeth and mandible of the earliest Homo look like, but that's it,' said Brian Villmoare, lead study author and associate professor in the department of anthropology at the University of Nevada, Las Vegas, in a statement. 'This emphasizes the critical importance of finding additional fossils to understand the differences between Australopithecus and Homo, and potentially how they were able to overlap in the fossil record at the same location.' The Australopithecus teeth broadly resembled those of the afarensis species in contour and the size of the molars, but features of the cusps and canine teeth had not been previously seen in afarensis or garhi teeth, Villmoare said. The teeth were also different in shape than those of any Homo species, or of the ancient human relative Paranthropus, known for its large teeth and chewing muscles. 'Obviously these are only teeth,' Villmoare said, 'but we are continuing field work in the hopes of recovering other parts of the anatomy that might increase resolution on the taxonomy.' Even just finding the teeth was a complicated task, according to Campisano. 'You're looking at little teeth, quite literally, individual teeth that look just like a lot of other of the little pebbles spread on the landscape,' he said in the video. 'And so, we have a great team of local Afars that are excellent fossil hunters. They've seen these things their entire lives walking around the landscape.' The new study is important because it provides insight into a time frame from 3 million to 2 million years ago, a mysterious period in human evolutionary studies, said Dr. Stephanie Melillo, paleoanthropologist and assistant professor at Mercyhurst University in Pennsylvania. Melillo was not involved in this research, but she has participated in the Woranso-Mille Paleontological Research Project in the Afar Triangle of Ethiopia. Part of the problem in learning about this stretch of prehistory is how ancient layers of dirt were deposited over the course of history in eastern Africa. 'Erosion in rivers and lakes were at a low level and only a little bit of dirt was deposited in the Afar,' Melillo wrote in an email. 'That deposited dirt contains the fossils — of our ancestors and all the animals that lived with us. When there is little deposition, there are few fossils.' A key feature helping archaeologists to understand humanity's evolution are structural basins, or 'bowls' on Earth's surface that naturally collect layers of sediment better than the surrounding landscape does — like the Turkana Basin stretching across southern Ethiopia and northern Kenya, Melillo said. Previous research has found evidence to suggest that Homo and Paranthropus coexisted there 1.5 million years ago. The new study focuses on the Afar Depression, a basin to the north of the Turkana. 'This contribution by Villmoare and colleagues demonstrates that in the Afar there was also some other species around with Homo — but it isn't Paranthropus,' Melillo said. 'Instead, they identify this 'non-Homo' genus as Australopithecus. They do a very convincing job of demonstrating why the new fossils are not Paranthropus.' The study adds to growing evidence that Australopithecus was not roaming the Afar Depression alone, she said. When Australopithecus and Homo were alive, the Afar Region, now mostly a semidesert, had much more seasonal variation in rainfall than it does today, Reed said. Millions of years ago, the environment there was still dominated by a dry season, but it was interrupted by a brief wet season. Rivers that carried water across the landscape existed for only part of the year. Few trees grew near the river, and the environment nearby was largely wetlands and grasslands. 'We have a fossil giraffe species that was eating grass, which probably indicates they were stressed as they eat trees and bushes almost every place else,' Reed said. 'Were the hominins eating the same thing? We are trying to find out by examining isotopes in their teeth and microscopic scratches on their teeth.' Understanding whether or not Homo and Australopithecus had the same food sources could paint a portrait of how our ancient ancestors shared or competed for resources, Reed said. The team also wants to try to identify which hominin made the stone tools found at the site. At the moment it's impossible to tell exactly how the two hominins coexisted, but Reed said she is hoping that future findings will provide more answers. 'Whenever you have an exciting discovery, if you're a paleontologist, you always know that you need more information,' Reed said. 'You need more fossils. More fossils will help us tell the story of what happened to our ancestors a long time ago — but because we're the survivors we know that it happened to us.' Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more.
