Oceanic core complex

An oceanic core complex, or megamullion, is a seabed geologic feature that forms a long ridge perpendicular to a mid-ocean ridge. It contains smooth domes that are lined with transverse ridges like a corrugated roof. They can vary in size from 10 to 150 km in length, 5 to 15 km in width, and 500 to 4000 m in height. Their counterparts on land are metamorphic core complexes, which form in areas of continental crustal extension or stretching.

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