Using advanced sediment core sampling and Geochemical Fingerprinting, a team of researchers has reconstructed the ancient course of the Ponnaiyar River in Tamil Nadu. The study, published in Geoarchaeology International, correlates major avulsion events (river course shifts) with the sudden relocation of Megalithic communities between 1200 BCE and 500 BCE.
The data reveals that the Iron Age inhabitants of the region developed a sophisticated system of "migratory urbanism," where settlements were designed to be modular and easily relocated in response to riverine volatility. This research provides a new framework for understanding the resilience of early South Indian civilizations in the face of fluctuating monsoon patterns and hydrological instability.