And you should not forget Sangam literature talk of Kumari Kudam(Lemuria) a land lost in sea....Either so called Dravidians were living in Indus Valley(Which many dravidian scholar believe)or they were living in kumari kudam.......
But with sangam document it is certain that they were living in Lemuria......and recent excavation of Pashupati seal and Swastika seal at indus valley proves that the so callled Aryans were living at Indus valley.
Even if you accept this non sense racial theory of Aryan Dravidian then also one thing is certain that both are indegenious population of India....
