Discovery of a century

The discovery of a Neolithic stone celt, a hand-held axe, with the Indus script on it at Sembian-Kandiyur in Tamil Nadu is, according to Iravatham Mahadevan, "a major discovery because for the first time a text in the Indus script has been found in the State on a datable artefact, which is a polished neolithic celt."

He has estimated the date of the artefact with the Indus script to be between 2000 B.C. and 1500 B.C.

More info on this interesting find in the Hindu

The juicier part in the article:
"This confirms that the Neolithic people of Tamil Nadu shared the same language family of the Harappan group, which can only be Dravidian. The discovery provides the first evidence that the Neolithic people of the Tamil country spoke a Dravidian language."