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Found this on a beach on the East coast of India - Vishakhapatnam, India

Is this a fossil? A coral?

enter image description here Its small enough to fit in my hand enter image description here These tunnel-like structures are hard like rock/calcified enter image description here Obverse enter image description here Obverse

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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.

enter image description here

there are whole blogs devoted to finding interesting examples. https://natureinfocus.blog/2010/01/13/calcareous-worm-tubes-on-flat-oyster-shells/

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