Haplogroup J2b is associated with the Neolithic Greeks that spread agriculture. It has been found in the Dravidian middle classes in high frequencies also in the Northwest. Apparantly a proto-Mediterannoid people mingled with the Dravidian peoples before the Indo-European speakers and creators of the Vedic civilisation (Arya's) arrived in India.
It is found in high frequencies in Southeastern Europe (Greek, the Balkans and the deep south of Italy)
It could also explain the Mediterannoid skull in alot of Indians.

"The Neolithic Age, Era, or Period, or New Stone Age, was a period in the development of human technology, beginning about 9500 BC."

This is interesting. I remember reading somewhere that one of the Dravidian people (may have been the Tamizh but I could be wrong) claim to be descendants of the people of Atlantis. Might be worth looking into.

Do you know that the Indus Valley Civilization was a Dravidian civilization? After their civilization ended (due to the river drying up according to many scholars), most of them left eastwards and southwards. Most of them settled down in South India and a big mass also went and settled down in the East (Yunnan province of China). When the Han chinese invaded Yunnan in 221BC, they defeated the Shendu (as they called them). There is a small smattering of Dravidians still left in NW Pakistan and Eastern Afghanistan as well.

Indus Valley might have been Dravidian with an proto-mediteranoid elite, thus J2b.