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Pumice is a type of volcanic stone that has a lot of trapped air or gas, and floats. However, most of the lighter pieces tend to be very small.

The explanations I'm seeing is that the stones in the region were actually made from a form of coral. It wasn't clear how they had been dried out, but presumably they would be naturally occurring in the area.

Archeological excavations are apparently finding these coral stones in lower layers under the bridge as if they were placed there.

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14y ago

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