Three language trajectories are shown.., and these are contemporaneous but not equal in prominence or carrying power. The central one, henceforth the… - Johanna Nichols

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Three language trajectories are shown.., and these are contemporaneous but not equal in prominence or carrying power. The central one, henceforth the steppe trajectory, shows the east-to-west spread of languages across the Eurasian steppe, and is based on four spreads: that of IE to Europe in the Bronze Age, that of Iranian to (and occasionally into) Central Europe during the Iron Age, that of Turkic in the early centuries of this era, and that of Mongolian beginning in the Middle Ages. To the north of it is the almost equally extensive forest trajectory through the northern forests. This is the route followed by the Uralic language family in its spread from the central Urals (c. the fourth or fifth millennium) as far west as Norway and Estonia (by perhaps the first millennium BC). To the south of the Caspian and Black Seas runs the southern or desert trajectory that brought the Mongols to the southern Caucasus, and before that Turkish to Turkey, and before that Iranian languages to ancient Persia and northern Mesopotamia, and still earlier Armenian, Hittite and its sisters, and other early IE dialects to Asia Minor.