So far archaeology and palaeontology, based on multi-variate analysis of skeletal features, have not found a new wave of immigration into the subcont… - 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.

Apparently, Dravidian speakers began influencing the Panjab only at this moment in time. Consequently, all linguistic and cultural deliberations based on the early presence of the Drav. in the area of speakers of IA, are void or they have to be reinvestigated. ... In short, the Panjab is an area of a Pre-rigvedic, largely Para-Munda substrate that apparently overlays a still older local level. Since no traces of the supposedly Dravidian language of the Indus civilization (Parpola 1994) are visible in the early RV (see below), the people who spoke this language must either have disappeared without a trace, or, more likely, the language of the Panjab was Para-Munda already during the Indus period (2600- 1900 BCE). Therefore, the most commonly used language among the languages of the Indus people, at least of those in the Panjab, must have been Para-Munda or a western form of Austro-Asiatic.... In short, even if Drav. had been the traders' language, it remains unexplainable why Drav. influence is only seen in the middle and late RV as well as later one (AV+). The reason cannot be, as van Driem (1999, appendix p. 2, quoting agreement with Parpola) supposes, that the oldest RV hymns were still "composed in more northerly areas, perhaps as far north as modern Afghanistan." (Parpola forthc.) On the contrary, even the oldest books of the RV (4-6) contain data covering all of the Greater Panjab...

“In South Asia, relatively few pre-Indo-Aryan place-names survive in the North; however, many more in central and southern India. Indo-Aryan place-names are generally not very old, since the towns themselves are relatively late.” (p 104)