Bactria Margiana Archaeological Complex
This culture existed from 2300 BC to 1700 BC. It existed on the territory of modern northern Afghanistan, eastern Turkmenistan, southern Uzbekistan and western Tajikistan in the upper reaches of the Amu-daria river.
This civilization is different from all the Indo-European civilizations as it in the end of its existence could be a mixtrue of indigenous people and Indo-European people. It is a very important culture for the future development of Iran and India.
BMAC traded with Elam and Indus Valley Civilisation. Around 2000 BC Andronovo Culture people after contact with BMAC created a new Tazabagyab Culture in the area of BMAC.
In the Northern Tajikistan area there were found kurgan (tumulus) burials associated with Andronovo and Tazabagyab Cultures mixed with BMAC.
Very interesting seems the image of a hero with a head of an eagle that holds two serpents in his hands or two animals (master of animals motif). This could be an image of Garuda eagle who hated Nagas (serpents) and hunted them down. This is a similar concept to a Norse Great Eagle from the top of Yggdrasil who hated a serpent-like Niðhöggr who eats the roots of the World Tree.
This might also be a depiction of a Sumerian god Ninurta, who was often shown with a head of an eagle. This would then maybe turn to the name of Indra (Intra, Inurta) among the Indo-Aryans.
The BMAC was eventually overrun by the Indo-Iranian migrations from the Andronovo Culture and the Sintashta Culture further north, and became Indo-Europeanized. The Indo-Aryans pursued their southward expansion, invading northern Pakistan and northwest India from 1800 BC to 1500 BC and eventually bringing about the demise of the Indus Valley Civilisation around 1300 BC.