Found this on a beach on the East coast of India - Vishakhapatnam, India
Is this a fossil? A coral?
Its small enough to fit in my hand
These tunnel-like structures are hard like rock/calcified
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3$\begingroup$ Doesn't look like a fossil because doesn't look rock-like enough and not buried. Maybe this? gohiking.ca/animals/fish/marine-worms/calcareous-tube-worm $\endgroup$– DKNguyenJun 28, 2022 at 17:16
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Its not a fossil.
It is just shells of various marine invertebrates that get stuck together as they grow. It looks like worm-snails on a a large piece of clam shell. the little holes in the clam shell are bored by sea snails and erosion.
there are whole blogs devoted to finding interesting examples. https://natureinfocus.blog/2010/01/13/calcareous-worm-tubes-on-flat-oyster-shells/
