I've got a piece of rock with piddock holes, in fact it's still got a few piddocks in it (I wasn't responsible for this piddock cruelty btw). But it's quite soft rock, shaley stuff. If you say your rock is basalty, could a humble piddock really chew through it? I dunno. It's just my Experience With Piddocks has been with softer rock.
Stones with holes are great though aren't they, I'm always looking out for them on the beach. There's folklore for them so you wonder whether they just have a form that catches people's eyes / imagination?
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