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A stash of thousands of advanced ancient tools have been found in India, dating back well before modern humans were even thought to have been living in Asia.
Scientists believe the stone implements, which may be as old as 385,000 years, could have been fashioned by an archaic species of our hominin ancestors.
But the tools appear to have been made with advanced techniques and feature blades, points and scrapers.
The fossilised remains were discovered by archaeologists from the Sharma Centre for Heritage Education in Chennai who began digging on a site 60km away in 1999, Nature reports.
British Geologist first found stone tools in the same spot in 1863.
The latest dig by archaeologists Kumar Akhilesh and Shanti Pappu excavated more than four metres below the surface, uncovering 7000 stone tools.
To estimate the age of the layers where the tools were found, scientists used a technique known as luminescence dating, which shows up how long ago the crystals in the layers saw light.
The tools are the oldest Middle Stone Age artefacts ever found in India. Before then, the oldest tools dated up to 140,000 years ago.
The oldest fossilised remains of modern humans were found in Morocco and are thought to be up to 350,000 years old.
But modern humans are not thought to have migrated outside Africa until about 185,000 years ago.
© Nine Digital Pty Ltd 2018
https://www.9news.com.au/world/2018/02/01/12/16/mystery-over-ancient-advanced-tools-found-in-india