Indo-Aryan migration

Indus Valley Civilization

Indo-Aryan migration into the northern Punjab is thus approximately contemporaneous to the final phase of the decline of the Indus-Valley civilization (IVC). Many scholars have argued that the historical Vedic culture is the result of an amalgamation of the immigrating Indo-Aryans with the remnants of the indigenous civilization, such as the Ochre Coloured Pottery culture. Such remnants of IVC culture is not yet present in the Rigveda, with its focus on chariot warfare and nomadic pastoralism in stark contrast with an urban civilization.

The decline of the IVC from about 1900 BC is not universally accepted to be connected with Indo-Aryan immigration. A regional cultural discontinuity occurred during the second millennium BC and many Indus Valley cities were abandoned during this period, while many new settlements began to appear in Gujarat and East Punjab and other settlements such as in the western Bahawalpur region increased in size. Shaffer and Liechtenstein stated that: "This shift by Harappan and, perhaps, other Indus Valley cultural mosaic groups, is the only archaeologically documented west-to-east movement of human populations in South Asia before the first half of the first millennium B.C..". This could have been caused by ecological factors, such as the drying up of the Ghaggar-Hakra River and increased aridity in Rajasthan and other places. The Indus River also began to flow east and floodings occurred. Jim Shaffer and other scholars have argued that these "internal cultural adjustments" could reflect "altered ecological, social and economic conditions affecting northwestern and north-central South Asia" and do not necessarily imply migrations.

At Kalibangan (at the Ghaggar river) the remains of what some writers claims to be fire altars have been unearthed. Some of their characteristics suggest that they could have been used for Vedic sacrifices. In addition the remains of a bathing place (suggestive of ceremonial bathing) have been found near the altars in Kalibangan. S.R. Rao found similar "fire altars" in Lothal which he thinks could have served no other purpose than a ritualistic one.