It's a rock that's been holed by boring clams: https://carnegiemnh.org/not-boring-clams/
If you want to know what kind or rock it is, I can't help you there.
this post was submitted on 03 Jul 2023
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What is this thing?
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Wow, that is fascinating! I wanted to know why it looks the way it does, and this answers my question. Thank you! Solved!
Hi OP, could you edit the title of this post to add [SOLVED]? Thanks!
You're welcome. Used to see rocks like that all the time when I lived at the beach, sometimes with the clam shells still embedded.
It looks like an igneous rock or a rock that was formed through the cooling of magma
Looks “far away in time”…
Looks like a rock