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Members of the Fossil Forum have been very helpful with previous submissions. I would appreciate comments/suggestions concerning some nautiloid cephalopod fossils that I have. Image 1 is typical of the Ordovician nautiloid cephalopod fossils found in the Cincinnatian region. Given the bryozoan encrustations, it clearly remained on the sediment surface for a period of time. One source suggests that you can only identify the species by slicing them lengthwise and examining the siphuncle; is this true? Images 2a and 2b are images of a significantly larger Ordovician nautiloid cephalopod that I have tentatively identified as a Cameroceras both due to its larger size and the very large siphuncle illustrated in Image 2b. Image 3 is also of a larger nautiloid cephalopod that appears to be a mold. If one assumes that the piece on the right side is part of the same fossil then it displays a quite small diameter siphuncle. The fossil in Image 3 does however appear to contain part of the living chamber. Lastly, Image 4 is of a nice endoceras Ordovician cephalopod from Ontario. This fossil appears to have been buried in fine grain sediments so it may very well have perished from suffocation during a sediment resuspension event. There does appear to be a layer on the surface. This brings me to the question: Did paleozoic cephalopod shells have a skin?
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Almost a year and a half ago, on my trip to Montour fossil pit, (and my first serious fossil hunt), I found a cephalopod, though not in shale. It was in some introduced gravel, and I immediately identified it as Michelinoceras - it has been my favorite animal for a really long time and I was very biassed. Later, because of the close septa, I thought it was spyroceras; then, since it didn't have annulations, orthoceratoidea indet. . After seeing some Treptoceras, then Cameroceras and Endoceras, I wondered if it were Treptoceras - the rock it is in I cannot identify. What is this cephalopod?
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