left a limestone island: Rurutu (Austral Islands) and down a basalt island Tahiti which are distinguished form the volcano.
majority of limestone islands are atolls, Rurutu is exceptional: it lifted an island because it would be ironed on a 2nd hot spot!
There are rocks 12mA beside others that only 0.9! Impossible on a typical hot spot island (Reunion Island, Hawaii .. .)
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