Pre-Human Fossils Suggest Mankind Emerged From Europe Rather Than Africa
Humanity first arose in the Eastern Mediterranean around 7.2 million years ago, suggests new analysis of fossils for a hominin species nicknamed “El Graeco.”
When an ancient, toothy lower jaw was found in 1944 in Pyrgos Vassilissis, Greece, few paid much attention to the fossil. World War II was still underway, so the discovery was largely overlooked by all but the most ardent anthropologists. Even Pyrgos Vassilissis, a former royal estate on the Greek mainland, is often bypassed by travelers on their way to bustling Athens.
Interest in both the fossil and Pyrgos Vassilissis may soon grow, however, owing to the announcement of an explosive finding by an international team of researchers. In a paper published in the journal PLOS ONE, the scientists outline how the jaw likely belonged to the earliest known hominin, or pre-human — providing evidence that the last common ancestor of chimps and humans lived in the Eastern Mediterranean.
A second paper describes what this region’s climate was like during the lifetime of the human-ish species, Graecopithecus freybergi, otherwise known informally as “El Graeco.” Taken together, the findings support the idea that regal Pyrgos Vassilissis lies within the site where humanity first evolved 7.2 million years ago.
Project leader Madelaine Böhme of the Senckengberg Center for Human Evolution and Paleoenvironment at the University of Tübingen, co-author Nikolai Spassov from the Bulgarian Academy of Sciences, and their colleagues analyzed both the Pyrgos fossil and a related upper premolar tooth unearthed in Azmaka, Bulgaria.
“El Graeco is the oldest known potential hominin,” Spassov said. He is several hundred thousand years older than the oldest potential pre-human from Africa: 6–7-million-year-old Sahelanthropus from Chad.
Anthropologists use the term hominin, or pre-human, because the last common ancestor of humans and chimps clearly retained both non-human primate and human characteristics. Although El Graeco is only known from the fossil jaw and premolar, Böhme and her team could see how these features were evolving into more human-like forms. Computer tomography visualized the internal structures of the fossils and found that the roots of the premolars were widely fused.
“While great apes typically have two or three separate and diverging roots,” Böhme said in a statement, “the roots of Graecopithecus converge and are partially fused — a feature that is characteristic of modern humans, early humans and several pre-humans including Ardipithecus and Australopithecus.”
“No other fossil and living non-human primate is known with such roots,” Spassov said, adding that the analysis of El Graeco’s environment determined that it was a savannah when this individual was alive.
The researchers studied microscopic fragments of charcoal and plant silicate particles, called phytoliths, to reconstruct what the past climate was like both in the Eastern Mediterranean and North Africa.
“The phytolith record provides evidence of severe droughts, and the charcoal analysis indicates recurring vegetation fires,” Böhme said. “In summary, we reconstruct a savannah, which fits with the giraffes, gazelles, antelopes, and rhinoceroses that were found together with Graecopithecus.”
The scientists further studied salts as well as uranium, thorium, and lead isotopes discovered in dust particles originating from the Sahara Desert and that are often transported during storms to the Mediterranean. Dating of these materials, and analysis of their spread, suggests that the Sahara originated around 8–7 million years ago.
“The incipient formation of a desert in North Africa more than 7 million years ago and the spread of savannahs in Southern Europe may have played a central role in the splitting of the human and chimpanzee lineages,” Böhme said.
The theory is now called the North Side Story, recalling a hypothesis made by anthropologist Yves Coppens, co-discoverer of the famous hominin “Lucy.” Coppens’ theory, known as the East Side Story, holds that pre-humans first evolved in Kenya’s Rift Valley.
The even bigger picture, taking into consideration African, Asian and European fossil evidence, indicates that the earliest primates originated in Asia more than 40 million years ago. At least some traveled to Africa. After many years of evolution, certain species — known as hominines, a term collectively referring to gorillas, chimps, humans and their direct ancestors — then traveled back to Europe and Asia around 14 million years ago, Böhme said.
“El Graeco’s ancestors are Eurasian hominines, such as Ouraanopithecus from Greece,” she continued.
The researchers have not ruled out that descendants of El Graeco migrated to Africa, but it is also now possible that these descendants and other early pre-humans remained in the Mediterranean and spread throughout Europe and Asia.
If so, they could have evolved into Neanderthals, Denisovans, and the other early humans known from such regions and that are directly related to people of European and Asian heritage today. If additional evidence in future supports such possibilities, it would obliterate most widely accepted teachings about early human history.
As Spassov put it, “Our new hypothesis is a smoking gun.”
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