Nothing mysterious about those Concretion's at all. https://en.wikipedia.org/wiki/Concretion https://en.wikipedia.org/wiki/Concretion About 20 years ago, the e

Nothing mysterious about those Concretion's at all. https://en.wikipedia.org/wiki/Concretion https://en.wikipedia.org/wiki/Concretion About 20 years ago, the end of my road was at Bowling Ball Beach, plenty of concretion's to see there at low tide. There are also a few different one's that are exfoliating from the cliff side that look like hamburgers, very cool. https://en.wikipedia.org/wiki/Bowling_Ball_Beach https://en.wikipedia.org/wiki/Bowling_Ball_Beach