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Moonstones are common on the beach after storms. These are sedimentary rocks that formed during the Cretaceous (Over 63-million years ago) when much of New Jersey was continental shelf and under 150-feet of water. Pieces that were not buried in the sediments before washing up have Star Coral growing on them. |
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Other rocks include: (Clockwise from the top) Peanutstone (Rusty-looking Iron-rich rocks of recent origin), Coal from shipwrecks, and Pumice that floats here on currents like the Gulf Stream from volcanic Caribbean islands or perhaps even Iceland. |
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Most of Sandy Hook is sand that is deposited by wave and current action. These are polished quartz grains which are sometimes called "beach diamonds." |
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Most other material found on Sandy Hook's beaches is brought there by human activities, like the bowl of this centuries-old "public" pipe found on the bayside. Visit the bay bottom. |
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