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enter image description here

I was hiking the other day in southeastern Kentucky and ran across this rock on a river bank. I've never seen a rock like this before. Can anyone here identify it?

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closed as off-topic by arkaia, Fred, Camilo Rada, Gimelist, Jan Doggen Apr 8 at 7:06

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – arkaia, Fred, Camilo Rada, Gimelist, Jan Doggen
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Looks like a fossil coral (or something similar). What happens if you drop vinegar on it? Does it fizz? $\endgroup$ – Gimelist Apr 7 at 1:10
  • $\begingroup$ "on a river bank" is not very much. Do you have a more precise location? A description of the area? Photo's? $\endgroup$ – Jan Doggen Apr 8 at 7:06
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Your rock is most likely colonial horn coral fossil. It is common fossil in middle Devonian Period in Kentucky. I won't venture a guess on species from just an image. Kentucky Geological Survey has a nice introductory guide to fossil corals.

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