In the 2nd millennium BCE, there may have been cultural contact between North and South India, even though South India skips a Bronze Age proper and enters the Iron Age from the Chalcolithic stage directly.
In February 2006, a school teacher in the village of Sembian-Kandiyur in Tamil Nadu discovered a stone celt with an inscription estimated to be up to 3,500 years old.[1][2] Indian epigraphist Iravatham Mahadevan postulated that the writing was in Indus script and called the find "the greatest archaeological discovery of a century in Tamil Nadu".[1]
Timeline of Phase in Bronze Age
Time line (BC)
Phase
Era
3300–2600
Early Harappan (Early Bronze Age)
Regionalisation Era c. 4000–2500/2300 BCE (Shaffer)[3] c. 5000–3200 BCE (Coningham & Young)[4]
Coningham, Robin; Young, Ruth (2015). The Archaeology of South Asia: From the Indus to Asoka, c. 6500 BCE – 200 CE. Cambridge University Press. ISBN978-1-316-41898-7.
Manuel, M. J. (2010). "Chronology and culture-history in the Indus Valley". Sirinimal Lakdusinghe Felicitation Volume. Battaramulla: Neptune. pp. 145–152.