The burial system followed by the people of Neolithic period continued into the Megalithic period.  

• A circular tomb using big stone slabs built upon the place of burial is known as a megalith. Such megaliths have been found in many parts of Tamil Nadu.  
• The urn burial system was another type of practice and is evidenced in Adichanallur (present Thoothukudi district). Black-ware is peculiar to burial sites in Tamil Nadu. 

Source: Tamil Nadu state board.