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Reklaw

Platteville Cephalopod

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Reklaw

So this is a fossil from Beloit Wisconsin found in the Platteville formation. I am pretty sure it is a cephalopod but I have no idea what genus or species. The siphuncle is hollow except for two septa that run right through it. 3" post-it note for scale.

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FossilNerd

I agree that it is a cephalopod, but I think it will be hard to say what genus or species this is. There are a few different straight cephalopods found in the Platteville Formation (Ordovician). It might be a section of Actinoceras, as I believe it is fairly common in that formation, but not sure.

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Manticocerasman

I would keep it at "Cephalopod orthocone" It will be hard to make out more of it.

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Reklaw

Thank you! Looks about right to me!

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Reklaw

An update to this post, I found a very similar looking fossil in "The Geology of Minnesota" (1872) and it is labeled as a Tripteroceras planodorsatum. And I found another one that was out of the matrix with the characteristic flattened triangle shape of the Tripterocerids, so I am pretty sure it is in fact a T. planodorsatum not a michelinocerid.

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