Jawbone discovered in Indonesian cave represents oldest human remains found in Wallacea

Jawbone discovered in Indonesian cave represents oldest human remains found in Wallacea
Excavated trench at Leang Bulu Bettue; an overview of the trench in the rock-shelter area viewed from south to north (2017). Credit: Brumm et al., 2021, PLOS ONE, CC-BY 4.0 (creativecommons.org/licenses/by/4.0/)

In a cave on the Indonesian island of Sulawesi, an international team of researchers has unearthed a jawbone that represents the oldest human remains ever found in Wallacea. The group has published a paper describing their find on the open-access site PLoS ONE.

Over the past several decades, archaeologists have found evidence of ancient people living in Wallacea, a cluster of Indonesian relatively near to Australia. In a called Leang Bulu Bettue, they found tools, trinkets and , but little in the way of human remains. In this new effort, the researchers found a jawbone with three molars attached. Dating of ornaments, pigments and portable art surrounding the find suggests the remains were from a modern human living in the area between 16,000 and 25,000 years ago, during the Ice Age. The find could shed light on the people who lived in the area during that time—scientists believe they were ancestors of people who arrived by boat thousands of years before, and the forebears of the first modern people to arrive in Australia.

Study of the jawbone showed that the person, whose gender is still unknown, suffered from a host of oral maladies. The molars were ground down, suggesting the person had used them as a tool for some purpose. And there was evidence of tooth loss, gum disease and cavities. This suggests the person's diet was carbohydrate-heavy. Additionally, the person was likely older, and had small teeth, suggesting that, like other early island , those living on Sulawesi were likely small in stature compared to those living in Europe.

The jawbone dates to the late Pleistocene, during the Ice Age. That means that ocean levels surrounding the island would have been lower—though not low enough to create a between the islands or to Australia. The researchers plan to continue searching for more evidence of the individual who left it behind.

More information: Adam Brumm et al, Skeletal remains of a Pleistocene modern human (Homo sapiens) from Sulawesi, PLOS ONE (2021). DOI: 10.1371/journal.pone.0257273

Journal information: PLoS ONE

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Citation: Jawbone discovered in Indonesian cave represents oldest human remains found in Wallacea (2021, September 30) retrieved 27 November 2022 from https://phys.org/news/2021-09-jawbone-indonesian-cave-oldest-human.html
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