Archaeologists at Keezhadi, Tamil Nadu, excavated brick structures and water channels from an ancient settlement referenced in Sangam literature, lacking firm chronological context. Researchers employed optically stimulated luminescence dating on sediment samples from beneath these structures to establish a timeline for flooding events. The findings indicate sediments were deposited during a high-energy flood approximately 1,155 years ago, covering the urban remains. This supports the idea that river dynamics and floods have historically shaped settlement patterns by burying and displacing communities. The study clarifies the temporal distinction between habitation and natural burial, aiding future excavation strategies and historical understanding within the changing late Holocene climate in South India.