The Indus date has been pushed back to 7500 BC, so says a recent research (given below). For those reading through the Ithihasas and Puranas of India, this is not a news at all, for we are able to decipher the history of the world running into tens of thousands of years from these texts. When we read them in conjunction with Tamil sangam inputs, we get a better picture of the past.
For example, the rise of human civilisation in the past one lakh years started in the southern seas in the Indian ocean – a fact which most of genetic researchers agree with. It had gone to the Northern hemisphere about 60,000 years ago after the Toba-effect subsided. Then when the North was covered with ice, a shift happened from North to South – not through India but through China to Sundaland (present day Indonesia). From Mahabharata narration (Anusasana parva – chapter 93) it is known that a migration following the sun's movement happened from north to south. This is cleverly explained in this chapter using the etymological meanings of names of the seven rishis and others.
From a region that was supplying Sibi (Typha angustifolia) in the northern latitudes, people had moved to the South where lotuses were growing. These two planets signify availability of food as these plants were completely edible with each part of them being eaten by people. Sibhi grows well in regions 40 degrees North, thereby locating the region at or near Altai mountains. (green circle in the picture below)