During the early Eocene and early Miocene, the collision of the Arabian platform with Laurasia closed and eliminated the Tethys Ocean from the area of what is now Anatolia. The closure of these masses of continental crust collapsed this ocean basin by middle Eocene and resulted in a progressive shallowing of the remnant seas, until the end of the early Miocene. Post-collisional tectonic convergence within the collision zone resulted in the total elimination of the remaining seas from East Anatolia at the end of early Miocene, crustal shortening and thickening across the collision zone, and uplift of the East Anatolian–Iranian plateau. Accompanying this uplift was extensive deformation by faulting and folding, which resulted in the creation of numerous local basins. The north–south compressional deformation continues today as evidenced by ongoing faulting, volcanism, and seismicity.