#PPOD: The Moeraki Boulders look almost too perfect to be natural — but these giant stone spheres along New Zealand’s Koekohe Beach were formed over millions of years.

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#PPOD: The Moeraki Boulders look almost too perfect to be natural — but these giant stone spheres along New Zealand’s Koekohe Beach were formed over millions of years. Scientists believe the boulders began as sediment on the ancient seafloor around 60 million years ago, gradually growing into massive calcite concretions before coastal erosion revealed them along the shoreline. Some are nearly 7 feet across and split open, revealing striking, crystal-filled cracks. Credit: Karsten Sperling #earth