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I found this a while back, but finally saw it as an Ammonoid. But which one I wonder. It is pretty thin. Unseen is the inner umbilical groove, but it’s likely not important for ID. Opposite side is unremarkable.

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Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

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Hi, i think that will be hard to identify it, but i agree that looks like an ammonoid.

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"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

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These are the listed suture patterns for Pennsylvanian Ammonoids from the book Fossils of Ohio. I agree, I think it will be hard to confirm a genus, let alone  family or order. No 1, or 3-6 are my best bets.

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Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

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