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In page 5th millennium BC:

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These Southern migrations into India contributed to parts of the Proto-Dravidian language, having multiple variants i.e., Proto-South Dravidian language based on geographical location, however the language itself is known to have largely been native to central India as well. This melting pot of cultures peaked from the 5th millennium BC into the 4th millennium BC.

  • Megaliths in South Asia are dated before 3000 BC, with recent findings dated back to 5000 BC in southern India.[8] Cultures within central India had metallurgy, trade, payment of dues (possibly taxes or contributions to religious ceremonies) and social stratification explored within the linguistics of the era.[citation needed]