Between the arrival of the Aryans ... and the formation of the oldest hymns of the Rigveda a much longer period must have elapsed than is normally th… - Michael Witzel

India possesses, it is true, a class of texts that proclaims to be a history of the subcontinent, the Puranas. …..Nevertheless, they have been used uncritically, e.g., by some historians such as R. Thapar, and by modern archaeologists as materials to establish their identifications of particular pre-historic cultures.

There is the following direct statement contained in the (admittedly much later) BSS, 18.44:397.9 sqq which has once again been over-looked, not having been translated yet: ‘Ayu went eastwards. His (people) are the Kuru-PañcAla and the KASI-Videha. This is the Ayava (migration). (His other people) stayed at home in the West. His people are the GAndhArI, ParSu and AraTTa. This is the AmAvasava (group)’.

Since the SarasvatI, which dries up progressively after the mid 2nd millennium BC is still described as a mighty river in the Rigveda, the earliest hymns in the latter must have been composed by C.1500 BC. (p. 98)