Archaeologists in Saudi Arabia have dug up the oldest human bone ever found in the country, discovering part of a middle finger believed to be some 90,000 years old.

The discovery, part of a joint project by scientists from Saudi Arabia and Oxford University in the UK, was announced Wednesday by the head of the Saudi Commission for Tourism and National Heritage, Ali Ghabban.

The joint project, called Green Arabia, began in 2012 and studies how various phases of climate change in the region have affected human migration and settlement.

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“The Green Arabia project has studied sites at ancient lakes in the Nafud desert,” Ghabban said, in reference to an area in the northern Arabian Peninsula, according to the Middle East Eye.

The bone was discovered during a dig at the Taas al-Ghadha site, close to the northwestern city of Tayma.

The findings, said Ghabban, suggest human habitation dating back some 325,000 years.