Before revision: Geology The oldest characterised volcanics come from Osbourn Seamount at 78.8 ± 1.3 and ages become younger in a non linear fashion towards the south east with a youngest age of 1.1 .
After revision: Geology The oldest volcanic rocks of the chain come from Osbourn Seamount at 78.8 ± 1.3 and ages become younger in a non linear fashion towards the south east with a youngest age of 1.1 .