The Indo-Aryan invasion(s) as an academic concept in 18th- and 19th-century Europe reflected the cultural milieu of that period. Linguistic data were… - Jim G. Shaffer

Shaffer (1993) refers to one set of data that undermines this simplistic portrayal of an apparent devolution and re-evolution of urbanization, which "has nearly become a South Asian archaeological axiom" (55). Although there appears to have been a definite shift in settlements from the Indus Valley proper in late and Post-Harappan periods, there is a significant increase in the number of sites in Gujarat, and an "explosion" (300 percent increase) of new settlements in East Punjab to accommodate the transferal of the population.

The discovery of extensive nonceramic occupations associated with early domesticates at Mehrgarh, dated to pre-6000 B.C. (Jarrige and Meadow, 1980). This site clearly establishes the antiquity of humans in the Greater Indus Valley and, therefore, provides the chronological depth, making plausible the hypothesis that the domestication of plants and animals and the rise of civilization"in the Indus Valley was an indigenous cultural process.

Given these characteristics, a preference for cattle, after 5000 B.C., undoubtedly influenced other social, economic and political rela­tionships, and suggests that cultural developments in South Asia did not simply parallel those in Southwest Asia, where groups did not have a comparable bias.