Although continental crust is more or less permanent, the ocean floor is constantly recycled by the tectonic processes that bring about continental drift.

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And what we are saying is that maybe this was much bigger, and there are many of these continental fragments that are spread around in the ocean.

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"At the moment the Seychelles is a piece of granite, or continental crust, which is sitting practically in the middle of the Indian Ocean, " explained Prof Torsvik.

BBC: Fragments of ancient continent buried under Indian Ocean

The mapping was primarily done along the continental slope, where the North American continent ends and drops into the Atlantic Ocean basin.

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