During the latest Paleozoic into the early Mesozoic, Pangaea lay extant, across the equator. Several slices were removed from the northeastern margin of Gondwana and drifted across the Tethys Ocean to collide with Asia. Most notable were the Cimmerian blocks that included Turkey, Iran, Afghanistan, Tibet, and Malaysia. The western fringe of Pangaea was adjacent to a long subduction zone that formed the eastern margin of the Pacific "ring of fire".
The supercontinent Pangeae dominates the Permian Earth. A new arc approaches western N. A. A new spreading center forms as Cimmeria rifts from Gondwana and marks the opening of the Tethyian Ocean.
Tectonics, Sedimentation, Paleogeography of North Atlantic Region
1st Order Global Tectonic Features
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