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The Bering Shelf is a broad continental shelf that lies between Alaska and the Soviet Far East. Its southern edge, quiescent today, was a south-facing active margin in Cretaceous time. In late Paleocene to early Eocene time, a north-facing arc-trench complex (the Olyutorsky-Bowers complex) collided with and obducted this active margin in the area of the Soviet Far East. Probably as a result, the Bering active margin was abandoned, and by late Eocene time, the modern Aleutian arc-trench system formed to the south. This tectonic reorganization welded the Olyutorsky-Bowers arc-trench complex, along with a trapped segment of oceanic crust, to...

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