/ Old bolts near Compass Point
They are probably natural. Some species of barnacle extract excess iron from seawater as a by-product of their filter feeding and deposit it in their oddly shaped outer shell (really a modified carapace). When they die, the rest of the shell decays leaving the rusty iron deposits and a charactistic hole where the original opening was.
They occasionally appear in all sorts of odd coastal locations. It causes no end of misunderstandings.
Alternatively the poster might have spotted bolts rather than dead molluscs? As they said 'bolts'.
I eagerly await a whole series of posts suggesting that bolts appearing on routes are, in fact, completely natural and nothing to worry about... :-)
> Alternatively the poster might have spotted bolts rather than dead molluscs? As they said 'bolts'.
In Cornwall, surely not?
They do look like rusty bolts... It's an easy mistake to make.
And barnacles are crustacea, not molluscs.
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