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Besides Keeladi, the excavation is also being carried out in nearby villages like Manalur, Kondhagai and Agaram.
During the sixth phase of excavation, interrupted for a couple of months due to the COVID-19 lockdown, archaeologists had found human skeletons, precious stones, weighing measures and ring well structures.
Artefacts obtained from the site revealed that people who lived in the region around 3,000 years ago had advanced knowledge and skills and could have been involved in trading activities.
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A Tamil Nadu State Archaeology department release said the Central Advisory Board for Archaeology has given it the nod for excavations in Keeladi and nearby areas, Adichanallur, Sivakalai and Korkai in southern coastal Thoothukudi district, Kodumanal in Erode district, Gangaikondacholapuram in Ariyalur district and Mayiladumparai in Krishnagiri district.
In addition, a field study will be done in Krishnagiri, Vellore, Dharmapuri, Tiruvannamalai and Salem districts to find new Stone Age sites, it said.
CABA has accorded permission to take up another field study in Tirunelveli and Thoothukudi districts on the theThamirabarani river civilisation, the statement added.