![]() ![]() ![]() The collision between the ancestral North American and African continental plates ended about 270 million years ago. Most of the rocks formed as sediments or volcanic rocks on ocean floors, islands, and continental plates igneous rocks formed when crustal plates collided, beginning about 450 million years ago. Metamorphic rocks of the mountains include (1) fragments of a billion-year-old supercontinent, (2) thick sequences of sedimentary rock that were deposited in subsiding (sinking) basins on the continent, (3) sedimentary and volcanic rocks that were deposited on the sea floor, and (4) fragments of oceanic crust. ![]() The Blue Ridge physiographic province is a high, mountainous area bounded by several named mountain ranges (including the Unaka Mountains and the Great Smoky Mountains) to the northwest, and the Blue Ridge Mountains to the southeast. The Southern Appalachian Mountains includes the Blue Ridge province and parts of four other physiographic provinces. Pubs Warehouse >SIM 2830 Geology of the Southern Appalachian Mountains By Sandra H.B. ![]()
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