Date:

Study cements age and location of hotly debated skull from early human Homo erectus

A new study verifies the age and origin of one of the oldest specimens of Homo erectus–a very successful early human who roamed the world for nearly 2 million years.

In doing so, the researchers also found two new specimens at the site–likely the earliest pieces of the Homo erectus skeleton yet discovered. Details are published today in the journal Nature Communications.

- Advertisement -

Homo erectus is the first hominin that we know about that has a body plan more like our own and seemed to be on its way to being more human-like,” said Ashley Hammond, an assistant curator in the American Museum of Natural History’s Division of Anthropology and the lead author of the new study. “It had longer lower limbs than upper limbs, a torso shaped more like ours, a larger cranial capacity than earlier hominins, and is associated with a tool industry–it’s a faster, smarter hominin than Australopithecus and earliest Homo.”

In 1974, scientists at the East Turkana site in Kenya found one of the oldest pieces of evidence for H. erectus: a small skull fragment that dates to 1.9 million years. The East Turkana specimen is only surpassed in age by a 2-million-year-old skull specimen in South Africa. But there was pushback within the field, with some researchers arguing that the East Turkana specimen could have come from a younger fossil deposit and was possibly moved by water or wind to the spot where it was found. To pinpoint the locality, the researchers relied on archival materials and geological surveys.

“It was 100 percent detective work,” said Dan Palcu, a geoscientist at the University of São Paulo and Utrecht University who coordinated the geological work. “Imagine the reinvestigation of a ‘cold case’ in a detective movie. We had to go through hundreds of pages from old reports and published research, reassessing the initial evidence and searching for new clues. We also had to use satellite data and aerial imagery to find out where the fossils were discovered, recreate the ‘scene,’ and place it in a larger context to find the right clues for determining the age of the fossils.”

Although located in a different East Turkana collection area than initially reported, the skull specimen was found in a location that had no evidence of a younger fossil outcrop that may have washed there. This supports the original age given to the fossil.

- Advertisement -

Within 50 meters of this reconstructed location, the researchers found two new hominin specimens: a partial pelvis and a foot bone. Although the researchers say they could be from the same individual, there’s no way to prove that after the fossils have been separated for so long. But they might be the earliest postcrania–“below the head”–specimens yet discovered for H. erectus.

The scientists also collected fossilized teeth from other kinds of vertebrates, mostly mammals, from the area. From the enamel, they collected and analyzed isotope data to paint a better picture of the environment in which the H. erectus individual lived.

“Our new carbon isotope data from fossil enamel tell us that the mammals found in association with the Homo fossils in the area were all grazing on grasses,” said Kevin Uno, a paleoecologist at Columbia University’s Lamont-Doherty Earth Observatory. “The enamel oxygen isotope data suggest it was a relatively arid habitat based on comparisons to other enamel data from this area.”

The work suggests that this early H. erectus was found in a paleoenvironment that included primarily grazers that prefer open environments to forest areas and was near a stable body of water, as documented by freshwater sponges preserved in the rocks.

Key to the field work driving this study were the students and staff from the Koobi Fora Field School, which provides undergraduate and graduate students with on-the-ground experience in paleoanthropology.

The school is run through a collaboration between The George Washington University and the National Museums of Kenya, and with instructors from institutions from around North America, Europe, and Africa. “This kind of renewed collaboration not only sheds new light on verifing the age and origin of Homo erectus but also promotes the National Museums of Kenya’s heritage stewardship in research and training,” said Emmanuel Ndiema, the head of archaeology at the National Museums of Kenya.

AMERICAN MUSEUM OF NATURAL HISTORY

Header Image Credit : A. Hammond/© AMNH

- Advertisement -

Stay Updated: Follow us on iOS, Android, Google News, Facebook, Instagram, Twitter, Threads, TikTok, LinkedIn, and our newsletter

spot_img
Mark Milligan
Mark Milligan
Mark Milligan is multi-award-winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 8,000 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW), the World Federation of Science Journalists, and in 2023 was the recipient of the British Citizen Award for Education, the BCA Medal of Honour, and the UK Prime Minister's Points of Light Award.
spot_img
spot_img
spot_img

Mobile Application

spot_img

Related Articles

Ancient underground chamber found in Cnoc Ard

A construction project in Cnoc Ard (Knockaird) on the Isle of Lewis has revealed a stone-built underground chamber, later identified by archaeologists as a Late Iron Age souterrain.

Caral burial unearthed at Áspero: Elite woman found remarkably preserved

Archaeologists from the Caral Archaeological Zone (ZAC), led by Dr. Ruth Shady Solís from the Ministry of Culture, have discovered a well-preserved burial at the Áspero archaeological site in Barranca Province, Peru.

Mesolithic figurine found in Damjili Cave offers new clues to Neolithic transition

A stone figurine discovered in Damjili Cave, western Azerbaijan, is providing archaeologists with new insights into the cultural and symbolic transition from the Mesolithic to Neolithic in the South Caucasus.

Bite marks confirm gladiators fought lions at York

A recent study published in PLOS One has identified bite marks on human remains excavated from Driffield Terrace, a Roman cemetery on the outskirts of York, England.

Treasures of the Alanian culture found in Alkhan-Kala necropolis

Archaeologists have discovered an intact burial mound containing the tomb of an Alanian elite during excavations at Alkhan-Kala west of Grozny, Chechnya.

Significant archaeological discoveries near Inverness

Archaeologists have made several major discoveries at the site of the upcoming Old Petty Championship Golf Course at Cabot Highlands, near Inverness, Scotland.

Maya ritual offering found in Yucatán caves

Archaeologists from the National Institute of Anthropology and History (INAH) have recovered a globular ceramic pot in Zumpango Cave, part of the extensive Garra de Jaguar system.

Archaeologists find UAE’s first major Iron Age necropolis

The Department of Culture and Tourism in Abu Dhabi has announced the discovery of the first major Iron Age necropolis in the United Arab Emirates.