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Are these gastropods or goniatites from the Formosa reef?


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I'm in the process right now of sorting out and identifying my finds from the Formosa Reef, Amherstburg Formation, Middle Devon from the roadcut just north of Formosa, Ontario on road #12. These ones here have got me somewhat stumped and I'm hoping that someone can help me out. You can see the 3-dimensionally spiraled gastropod in the following 3 photos, first on the right and then on the left. I'm thinking that it may be a Mourlonia sp., as Tidgy's dad suggested in Monica's report on the site. But what concerns me are the 2 other ones. They are not 3-dimensionally spiral, but rather planspiral, which makes me wonder if they might not be goniatites, even though I can't make out any lobes on them. I haven't been able to find anything like these within this time frame on the internet, so I'm hoping for some suggestions here.









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Kane just sent me a helpful paper, so I've been able to determine that the Mourlonia sp. is not one, but rather a "Pleurotomaria" sp. and that the other 2 are indeed gastropods going under the name of "Bellerophon" sp.

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