This photo from Louise shows a rock on Coral Beaches. It looks to me like basalt lava, highly eroded by the sea. There are of course whole cliffs of basalt lava at Talisker Bay but that's quite a distance away, so it would be interesting to know whether there is a lot of basalt lava under the sands at Coral Beaches and, if so, why there are no laval cliffs here as at Talisker Bay
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