Andipatti is located at 15 Km from Chengam town in Chengam taluk of Tiruvannamalai District. Systematic excavation was carried out by the Tamil Nadu State Department of Archaeology in the year 2004-2005.

Excavation at two sites namely Nattamedu and Sambalkadu, yielded pottery of Megalithic and Historic period. Pottery collection include Black and Red ware sherds and coarse red ware sherds. On the basis of unearthed antiquities such as terracotta objects and figurines of 6th to 12th Century CE and megalithic appendages, it is understood that this site had been continuously inhabited since 1st Century BCE till 12th Century CE.

The remarkable findings include inscribed postsherds, graffiti postsherds and terracotta figurines of mother goddess. Two cultural periods were demarcated from the unearthed antiquities.