sentences:  He suggests that proto-Indo-European formed mainly from a base of languages spoken by Eastern European hunter-gatherers, with some influences from the languages of Caucasus hunter-gatherers.According to Anthony, hunting-fishing camps from the lower Volga, dated 6200-4500 BCE, could be the remains of people who contributed the CHG-component, migrating from the south-east Caucasus, who mixed with EHG-people from the north Volga steppes.The resulting culture contributed to the Sredny Stog culture, a predecessor of the Yamnaya culture.