The sample will be sent to Beta Analytical Lab, Florida, USA, for exact dating.
An iron dagger with a wooden handle was found inside a burial urn unearthed at Konthagai village, which is part of the Keeladi cluster where the seventh phase of excavation is in full swing to establish the existence of an urban civilisation in the Sangam era.
The second season of digging started in February at Konthagai where 25 burial urns have been unearthed so far and 11 of them have been opened, according to R. Kaviya, one of the four Site Archaeology Officers. These urns measure 95 to 105 cm in height with a circumference of 80 cm. Some of the urns contained iron weapons, shaped like knives, and spears and small terracotta vessels.