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A multichannel seismic survey of the Tagus abyssal plain defines the extent of oceanic crust and the continent-ocean boundary. This boundary is marked by landward-dipping reflectors. The oceanic domain is divided into two parts: a deep eastern basin, where an abandoned earliest Cretaceous spreading center is inferred, and a shallower western basin formed after a ridge jump. This latter oceanic domain may have a western complement in the Newfoundland basin.

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