Within Anatolia, regional volcanism started in the middle-late Miocene. During the late Miocene–Pliocene period, widespread volcanism blanketed the entire East Anatolian–Iranian plateau under thick volcanic rocks. This volcanic activity has continued uninterrupted until historical times. Apparently, it reached a climax during the latest Miocene–Pliocene, 6 to 3 Ma. During the Quaternary, the volcanism became restricted to a few local volcanoes such as Mount Ararat. These volcanoes are typically associated with north–south tensional fractures formed by the continuing north–south shortening deformation of Anatolia.