This is something I’ve always wondered. Perfect example is the beach in Cobourg Ontario. West of the harbour, or “upstream” the beach consists of large pebbles; and East of the harbour, is a natural sand beach. So I can only conclude that the natural current, although very slow. has something to do with it. It’s like the harbour acts like a snow fence and allows the lighter sand to curl around and settle in the lee, while the heavier pebbles settle on the upstream side.
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