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I found this picture with a caption saying this is door knobs found in coal. I believe it to actually be some type of coral or other formation under water. But would like some further advice to clarify what exactly it is! Any information will help!

Google

I found this picture with a caption saying this is door knobs found in coal. I believe it to actually be some type of coral or other formation under water. But would like some further advice to clarify what exactly it is! Any information will help!

Google

I found this picture with a caption saying this is door knobs found in coal. I believe it to actually be some type of coral or other formation under water. But would like some further advice to clarify what exactly it is! Any information will help!

Google

I found this picture with a caption saying this is door knobs found in coal. I believe it to actually be some type of coral or other formation under water. But would like some further advice to clarify what exactly it is! Any information will help!