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Upper Carboniferous Unknown - Fossil in shale phosphorite nodule

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Hi All, 


I'm having trouble identifying what I have here. It's from the Upper Carboniferous - Pennsylvanian Stark shale. It is in a phosphorite nodule. Dimensions are 1.5 inch (3.81 cm) long by 1 inch (2.54 cm) wide. Any ideas would be appreciated. 


Apologies for the green tint - not sure what that is except for maybe the camera picking up the radiation from this shale layer :P.









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Could possibly be vertebrate material, maybe fish skull material, but I’m not sure

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Actinopterygian (ray-finned fish) parasphenoid. An actinopt expert might be able to ID it more definitely.

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