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Unusual rock or fossil??


Michele7

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Hi!  I found this a few years ago and due to the texture snd shapes, I believe it is a fossil but not certain.  I asked an archeologist but he thought just a rock that formed in cracks of other rocks. That did not ring true to me with all the shapes plus he was not a paleontologist.  However,  I’ve looked at many images of fossils and cannot find anything similar.  Anyone else?  Atttached photos from every angle. Any information would be greatly appreciated! 

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Probably strongly limonitized siderite (ironstone) or pyrite/marcasite concretion. Last two pics possibly show the "fresh" core.

The knobby surface points more towards former pyrite/marcasite than siderite.

Franz Bernhard

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