1. 6500-3100 BC, Pre-Harappan, early Rig Vedic
2. 3100-1900 BC, Mature Harappan 3100-1900, period of the Four Vedas
3. 1900-1000 BC, Late Harappan, late Vedic and Brahmana period
The sequence of development in the literature does not parallel a
migration into India but the historical development of civilization in India
from the Sarasvati to the Ganges.
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