Moeraki Boulders. Otago. NZ, At Moeraki, 40 kilometres south of Oamaru, New Zealand, huge spherical boulders are scattered along the beach. Others can be seen emerging from the sandstone cliffs. Each boulder weighs several tonnes and is up to two metres to Maori legend, the boulders are gourds washed ashore from the great voyaging canoe Araiteuru when it was wrecked upon landfall in New Zealand hundreds of years explain the boulders as calcite concretions formed about 65 million years ago. Crystallization of calcium and carbonates around charged particles

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