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of the rise. In this area about 0.1% of the rise's seafloor was classed as hard substrata based on a combined area of 31 km2 for 16 volcanic peaks. Sandstone rocks dredged from the central Lord Howe Rise contained granite pebbles that were in the range 216-183 million years old. It was rifted away from Eastern Australia in association with a mid-ocean ridge that was active from 80 to 60 million

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