Caspian Sea and a Pleistocene stage, that includes glaciation cycles and the creation of the present Volga River. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the Kopet Dag and Caucasus Mountains, setting definitive south and west boundaries to the Caspian basin. This orogeneic movement was continuous throughout the years, while Caspian was regularly disconnecting from the Black Sea. In the late Pontian, a mountain arch rose across the south basin and divided it
Black Sea–Caspian Steppe held mountain Dagestan but did not reach the steppes. Steppe: Since the Don and Volga are not significant barriers the history of most of this area is part of the general history of the Pontic-Caspian steppe. Since this area is far from the centers of literate civilization it is hard to know the details of what happened. Variations in dates below represent early ancestors, late survivals and other irregularities. The pre-Scythian inhabitants of the steppe may have been Cimmerians who may have been a Thracians-Iranian mix with an Iranian elete. From around the ninth century BC the nomads of the