It is clear that this period of more than 700 years was not a chaotic Dark Age, but rather a time of reorganization and expansion. - Jonathan Mark Kenoyer

More surveys have revealed large, post-Harappan settlements in the Indus region after the major Indus centres were abandoned. . . . Research . . . is beginning to demonstrate that there really is no Dark Age isolating the protohistoric from the historic period.

During the Harappan Period (Harappa Phase, 2600…1900 BC) there was a dramatic increase in terracotta cart and wheel types at Harappa and other sites throughout the Indus region. The diversity in carts and wheels, including depictions of what may be spoked wheels, during this period of urban expansion and trade may reflect different functional needs, as well as stylistic and cultural preferences. The unique forms and the early appearance of carts in the Indus valley region suggest that they are the result of indigenous technological development and not diffusion from West Asia or Central Asia as proposed by earlier scholars.

Sites such as Harappa continued to be inhabited and are still important cities today. . . . Late and post-Harappan settlements are known from surveys in the region of Cholistan, . . . the upper Ganga-Yamuna Doab,. . . and Gujarat. In the Indus Valley itself, post-Harappan settlement patterns are obscure, except for the important sites of Pirak. . . . This may be because the sites were along the newly-stabilized river systems and lie beneath modern villages and towns that flourish along the same rivers.