Ancient rock paintings, a 700-year-old inscription and a tunnel-like cave were discovered in the Gudiyam forest area of Tiruvallur district, Tamil Nadu.
The discoveries include Early Iron Age paintings dating back more than 3,000 years.
Prehistoric human activity has been documented at 18 out of 40 locations during a four-month survey.
Rock paintings were found at Kuralchavadu Sunai, Pasumaadu Parai and Kannithoppu, featuring human figures and geometric designs.
A tunnel-like cave called Vavaal Cave (Bat Cave) was documented, measuring 11.87 metres in length.
A 14th-century inscription, about 700 years old, records that a carpenter named Veera Gangathattan excavated a spring at the site.