Crinoid. There are still some versions of them alive in spots in the ocean. OLD species. Have made it through many mass extinctions. Mostly all I’ve ever found is just the calyx or the stem stalk pieces, takes some skill to get the whole thing out of the rock like that (normally found in certain limestone formation if I’m remembering correctly).
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u/UFI420 2d ago
They look like the octopus robots from The Matrix