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The Moeraki Boulders

The Moeraki Boulders are geological marvels, exposed by erosion of sedimentary rocks laid down from 65 to 13 million years ago. They are formed by the gradual precipitation of calcite in mudstone over 4 million years. These spherical concretions are internationally significant for their scientific value and are a popular tourist attraction. Location Moeraki is on the East Coast of the South Island of New Zealand. 35 km south of Oamaru, and 80 km north of Dunedin.

Moeraki Boulder NZ

The Moeraki Boulders are unusually large and spherical boulders lying along a stretch of Koekohe Beach on the wave-cut Otago coast of New Zealand between Moeraki and Hampden. They occur scattered either as isolated or clusters of boulders within a stretch of beach where they have been protected in a scientific reserve. The erosion by wave action of mudstone, comprising local bedrock and landslides, frequently exposes embedded isolated boulders. These boulders are grey-colored septarian concretions, which have been exhumed from the mudstone enclosing them and concentrated on the beach by coastal erosion. The Moeraki Boulders are unusually large and spherical boulders lying along a stretch of Koekohe Beach on the wave-cut Otago coast of New Zealand between Moeraki and Hampden. They occur scattered either as isolated or clusters of boulders within a stretch of beach where they have been protected in a scientific reserve. The erosion by wave action of mudstone, comprising local bedrock and landslides, frequently exposes embedded isolated boulders. These boulders are grey-colored septarian concretions, which have been exhumed from the mudstone enclosing them and concentrated on the beach by coastal erosion

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