The Pre-Harappan and the Harappa cultures are not two disparate entities but urban and rural aspects of the same cultural phenomenon. The Harappan phase at Kot Diji, Amri and Kalibangan, should not be understood as one culture supplanting another, but like a city corporation taking over a sub-urban village to urbanise.

It is obvious that in north and west Rajasthan tectonically changed paleochannel configurations were a major factor which affected the human settlements, perhaps from the pre-Harappan times onwards. Major diversions cut off the vital tributaries and growing desiccation . . . dried up the once mighty Saraswati and Drishadvati rivers.