Inside the boulders are numerous cracks, called septaria, which radiate outward from a hollow core filled with crystals.
Their origin is unclear and unexpected locations remain largely unexplained.
Click on image to enlarge
However, the most widely accepted scientific view is that they are mineral concretions - hard masses that formed 60 million years ago in mudstones—layers of softer sedimentary rocks (rocks which are laid down in oceans, lakes or rivers).
These mudstones were later uplifted and now form a cliff at the back of the beach.
There, gradual erosion exposes and releases the boulders, which eventually roll down onto the beach.
People ask questions: why are they so perfectly round? Where did they come from? Are they some kind of fossils? Or perhaps alien eggs or strange unknownto humans energy storage devices from an alien ship that crashed long time ago?
The Maori people relate the remarkable spherical boulders to the wreck of the great canoe Arai Te Uru. As it was travelling south, the canoe foundered in a storm near Matakaea (Shag Point).
Click on image to enlargeImage Credit Flickr User cdholdsworth
The boulders and their origins continue to fascinate tourists, geologists and folklorists.
They have been also found in China, Israel and in Saint-André-de-Rosans in the Hautes-Alpes, France (image below)
Click on image to enlargePhoto credit: Gérard Friès, Olivier Parize
and Champ Island located in the central area of Franz Josef Land, Russia. Those found at Cape Triest are comparable Moeraki boulders in New Zealand. Other stone balls have been found in the village of Boguchanka in the north of Irkutsk region.
The Moeraki Boulders are unique to New Zealand but not to the world. For example, boulders - 3 meters in diameter - have been found in the USA at Cannonball River within Morton and Sioux Counties of North Dakota, while boulders 4-6m across exist at the Frontier Formation in northeast Utah and central Wyoming.
Perhaps no other rocks found in Ohio generate so much public interest and curiosity than the large carbonate spheres, known as concretions, that weather out of the Devonian-age Ohio Shale. Along the outcrop belt of the Ohio Shale from Adams County on the Ohio River northward to Lake Erie, these orange-colored globes are a familiar sight as garden and yard ornaments and driveway markers.
Many of them reach 9 feet or more in diameter. There is much speculation on the origin of these giant formations.
The nature forms spherical fantastic stone formations. The geological process that originate them can last millions of years.
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Geological Rift That Baffles Scientists Is Still Expanding