"The BMAC and the Andronovo are contemporary but their archaeological cultures and environmental settings are vastly different. Passages from the Avesta and the Rigveda are quoted by dif- ferent authors to support the Indo-Iranian identity of both the BMAC and the Andronovo. The passages are sufficiently general as to permit the Plains Indians of North America an Indo-Iranian identity! Furthermore, archaeology offers vir- tually no evidence for BMAC influence on the steppe and only scant evidence for an Andronovo presence within the settlement of the BMAC. There is little archaeological evidence within the settlements to support the notion that the Andronovo and the BMAC experienced a significant and/or sustained contact. Yet, settlement surveys indicate that the distinctive communities were close neighbors, exploit- ing the same environment. There is certainly no evidence to support the notion that the BMAC and the Andronovo shared a common ancestor. To date the horse has not been identified in the BMAC and the very diagnostic metal inventories that characterize both cultures are entirely absent in the other. There is simply no compelling archaeological evidence to support, or for that matter to deny, the notion that either one, both, or neither are Indo-Iranians."
January 1, 1970
https://en.wikiquote.org/wiki/Bactria%E2%80%93Margiana_Archaeological_Complex