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Fossil skull suggests human ancestors emerged 200,000 years earlier than thought

Fossil skull suggests human ancestors emerged 200,000 years earlier than thought

This newly discovered fossil is a hugely important find, say scientists. It means that one of our earliest ancestors possibly originated in southern Africa. Read more

Side view of most of brown fossil skull, pieced together from fragments.

The Homo erectus cranium labeled DNH 134 and nicknamed “Simon” – from approximately 2 million years ago – from the Drimolen Fossil Hominin site in South Africa’s Cradle of Humankind. Homo erectus is thought to be a direct ancestor of modern humans and the first human ancestor to spread widely across the world. Image via Matthew V. Caruana/ The Conversation.

By Stephanie BakerUniversity of JohannesburgAngeline LeeceJesse MartinLa Trobe UniversityMatthew CaruanaUniversity of JohannesburgProf. Andy I.R. HerriesLa Trobe University, and Renaud Joannes-BoyauSouthern Cross University

The human evolutionary path is complicated. It’s almost impossible to say exactly when we modern humans became “us.” This quandary is best articulated by the famous naturalist Charles Darwin in his book “The Descent of Man“:

In a series of forms graduating insensibly from some apelike creature to man as he now exists, it would be impossible to fix on any definite point where the term ‘man’ ought to be used.

The understanding of modern humans’ own genus, Homo, has taken many turns over the last century. Homo erectus, one of our purported ancestors, was first discovered in Indonesia in 1891 by geologist and anatomist Eugene Dubois. Since then, representatives of both this species, and other Homo, have been found across the world; for instance, in 2015, a new species of Homo, Homo naledi, was discovered in South Africa. Another new Homo species, Homo luzonensis, was foundmore recently in the Philippines in 2019.

These discoveries, combined, have led scientists to set Homo erectus‘ emergence at about 1.8 million years ago – with the oldest known record coming from Dmanisi, Georgia, and an important slightly later record from the East African Rift valley.

But our new discovery in South Africa’s Cradle of Humankind – located about 31 miles (50 km) northwest of Johannesburg, South Africa, and one of the world’s most important paleoanthropological sites – suggests that Homo erectus actually emerged 200,000 years earlier than we thought. We were part of a team from South Africa, Australia, Italy and the U.S. that discovered a Homo erectus cranium which has since been dated to almost 2 million years ago. The work was published in Science on April 3, 2020.

This is a hugely important find. It reasserts that Homo erectus’ origins are in Africa, not Asia. Our discovery suggests, though, that Homo erectus likely did not evolve in eastern Africa as so often thought but perhaps somewhere else in Africa, or potentially in South Africa itself.

More evidence is needed before firm conclusions can be reached, of course. But the South African find means that the Drimolen fossil site – where we made the discovery – could represent an important shift in the simple narrative that all early species of human ancestry are East African.

A critical discovery

The Drimolen Fossil Hominin site in the Cradle of Humankind, northwest of Johannesburg, has been excavated since its discovery in 1992. The site is best known for its Paranthropus robustus, another ancient hominin species with massive teeth, as well as some early Homo fossils. The most famous specimen from Drimolen is the most complete skull of Paranthropus robustus ever discovered, DNH 7.

It was here that members of our team found the fossil cranium that has been named DNH 134. Its nickname is Simon, named for the site technician whose contribution to the team was immeasurable. Simon Mokobane sadly passed away in 2018, but his expertise, unwavering support and fossil knowledge will forever be remembered.

In 2015, during the Drimolen Field School, a student named Richard Curtis began excavating an intriguing, but highly fragmented specimen. At first, no one was sure what it was from but in-field reconstructions quickly revealed that it was a hominin cranium.

We used a battery of dating methods, including Uranium-lead dating on the flowstones, Uranium-Series Electron Spin Resonance on fossil teeth and Palaeomagnetism on sediments. Each of these complementary techniques helped to establish a very narrow age of 2.04-1.95 million years for the whole Drimolen Main Quarry and the fossils found in it, including DNH 134.

DNH 134 is extremely significant. Its discovery and dating means that the story of Homo erectus and its journey out of Africa is more complicated than previously thought. Also, we know too that South Africa played a seminal role in this key species that ultimately led to us.

Next steps

Work will continue at the Drimolen site. We aim to continue excavating using a new method where our efforts are focused along the breccia (fossilized rock with fossils in it). This has proved fruitful with not only the discovery of DNH 134, but also a male Paranthropus robustus skull (DNH 152; also discussed in the Sciencearticle) as well as a number of other hominin remains we are still studying.

The site also has a wide variety of animal fossils from both extinct and living species, all of whom add to the overall story that we aim to build about how our ancient ancestors lived.

We will also continue to encourage young paleoanthropologists from across the African continent to get involved in excavations. The site hosts an annual field school with international partner institutes and offers full scholarships exclusively to students from African countries (South Africans have first preference).

The idea behind this is to ensure that researchers from the continent and country are at the forefront of future discoveries that add to the human story.

By Stephanie Baker, Researcher in Palaeoanthropology, University of JohannesburgAngeline Leece, Palaeoanthropologist; Jesse Martin, Ph.D. Researcher, La Trobe UniversityMatthew Caruana, Lecturer in Archaeology, University of JohannesburgProf. Andy I. R. Herries, Head of Department of Archaeology and History, La Trobe University, and Renaud Joannes-Boyau, senior research fellow, Southern Cross University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Bottom line: A new discovery of a Homo erectus skull in South Africa indicates that the species may be 200,000 years older than thought.

Source: Contemporaneity of Australopithecus, Paranthropus, and early Homo erectus in

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