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Rock group on the beach.

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

Multiple Concretions

Multiple Concretions

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

Unreally spherical rocks concretions in Nahal Keidar reserve, South Israel

Unreally spherical rocks concretions in Nahal Keidar reserve, South Israel

On the beach Moeraki.NZ

The Moeraki Boulders are situated on Koekohe Beach at a place named Kumara, midway between Hampden and Moeraki townships in North Otago. Access to them is gained by a small one-way side road, 1 mile north along the main road from Hillgrove railway station. The boulders are grey-coloured septarian concretions, which have been eroded out by wave action from the cliffs of soft, black mudstone that back the beach. In places, partially exposed concretions can be seen in the cliffs. They originally formed on the sea floor when the mudstone was accumulating during the early Tertiary period some 60 million years ago. The Moeraki Boulders are situated on Koekohe Beach at a place named Kumara, midway between Hampden and Moeraki townships in North Otago. Access to them is gained by a small one-way side road, 1 mile north along the main road from Hillgrove railway station. The boulders are grey-coloured septarian concretions, which have been eroded out by wave action from the cliffs of soft, black mudstone that back the beach. In places, partially exposed concretions can be seen in the cliffs. They originally formed on the sea floor when the mudstone was accumulating during the early Tertiary period some 60 million years ago.

Stones that grow

Stones that grow

Koutu Beach Concretions New Zealand

Koutu Beach Concretions New Zealand

Cannonball Concretions Theodore Roosevelt N P

Cannonball Concretions Theodore Roosevelt N P

Cannonball Concretions Theodore Roosevelt N P

Cannonball Concretions Theodore Roosevelt N P

Ulmet concretions (Babele de la Ulmet)

Ulmet concretions (Babele de la Ulmet)

The Moeraki Boulders NZ

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. 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.

Strange shaped rocks

Strange shaped rocks

Focus Stacked Image of Concretions in Theodore Roosevelt North U

Focus Stacked Image of Concretions in Theodore Roosevelt North U

Unreally spherical rocks concretions in Nahal Keidar reserve, South Israel

Unreally spherical rocks concretions in Nahal Keidar reserve, South Israel

Trovanti museum

Strange geological phenomenon, the trovanti or sand concretions being also called the growing stones in Trovanti Museum Costesti, Romania

Concretions Koutu Beach Northland New Zealand

Concretions Koutu Beach Northland New Zealand

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.

Output Ferriferous Concretions in white clay soil. Output Ferriferous Concretions in white clay soil.

Natural basins created by calcareous concretions. Natural basins created by calcareous concretions

Moeraki Boulder

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.

Ulmet concretions (Babele de la Ulmet)

Ulmet concretions (Babele de la Ulmet)

Pumkin Patch

Concretions in the River

Concretions in the River

Moeraki Boulders. Otago. NZ.

At Moeraki, 40 kilometres south of Oamaru, 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 high.According 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 ago.Scientists explain the boulders as calcite concretions formed about 65 million years ago. Crystallization of calcium and carbonates around charged particles gradually formed the boulders in a pearl-like process that took as long as four million years. The soft mudstone containing the boulders was raised from the seabed around 15 million years ago; waves, wind and rain are excavating them one by one. At Moeraki, 40 kilometres south of Oamaru, 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 high.According 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 ago.Scientists explain the boulders as calcite concretions formed about 65 million years ago. Crystallization of calcium and carbonates around charged particles gradually formed the boulders in a pearl-like process that took as long as four million years. The soft mudstone containing the boulders was raised from the seabed around 15 million years ago; waves, wind and rain are excavating them one by one.

Moeraki boulders and kelp, Otago, New Zealand

Moeraki boulders and kelp, Otago, New Zealand

Moeraki Boulders.Otago.

he 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. he 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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