The discovery of two punch-marked coins of the Sangam era, with symbols of sea turtles, marked the first of its kind found in the archaeological history of Adichanallur.
It is a historic site located in the lower valley of Tamirabarani in Srivaikuntam taluk, Thoothukudi district.
Adichanallur was largely known as an ancient burial mound where funerary urns were found.
The site was first excavated by German archaeologist Dr. Jagor in 1876.
With the latest collection of findings (punch-marked coins), the archaeological recovery suggests Adichanallur could have either been a coin manufacturing site or one of the earliest places of human settlement.