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Found 9 results

  1. 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?
  2. Tetradium

    Endoceras proteiforme

    From the album: Minnesota Ordovician Decorah Cephalopods

    A large Endoceras proteiforme. From Decorah shale. Only a little section of the shell remains on the lower half. The segmented part are septum and the smooth part are siphuncle.
  3. Fullux

    Endoceras?

    I found several remains of an orthoconic nautiloid yesterday while hunting in the Drakes Formation. I was showing it to @FossilNerd and he was unsure if it could be from the Ordovician Drakes Formation, or if I found it where the Drakes overlaps with another younger formation. Is there anyone who knows of such a formation or if this is indeed an Ordovician nautiloid? If it is Ordovician, that would most likely make it Endoceras, as this is the only nautiloid that I have found to have some kind of record in this area. The area in particular of the Drakes Formation is the Bardstown Reef. Here's some websites I frequently use to identify things from the Drakes. https://www.mindat.org/paleo_loc.php?id=19139 https://www.uky.edu/KGS/fossils/fossil-kinds-found-in-ky.php
  4. Bringing Fossils to Life

    What is this cephalopod?

    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?
  5. Ludwigia

    Endoceras sp. ? (Hall 1847)

    From the album: Nautiloidea

    14.5cm. I'm not at all sure about the id. Just going by size. It could also be a Treptoceras sp. From the Ordovician Hirnantian stage of the Queenstown Formation. Found at Big Bay on the Bruce Peninsula, Ontario.
  6. JUAN EMMANUEL

    Endoceras proteiforme

    From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)

    Endoceras proteiforme, found in the Humber river area. Late Ordovician, Georgian Bay formation, Toronto, Ontario. Length is approximately 35 cm long with a nickel shown. This specimen is a portion of the whole fossil that is still to be excavated (it's just so difficult to dig out) and the remaining body of this thing is still there at the site where I got this.

    © (©)

  7. fossilzz

    Endoceras Sp.

    From the album: Finds From the Ordovician -488 to 443 MYA-

    Section of Endoceras, from the Collingwood member of the Lindsay (Cobourg) Fm.
  8. ToeKnee

    Endoceras?

    I found these in the McGregor member of the Platteville formation in SW Wisconsin. Endoceras?
  9. JUAN EMMANUEL

    Endoceras proteiforme with Endocone Speiss

    From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)

    Endoceras proteiforme (Hall, 1847) with a conical endocone speiss. Found in Mimico Creek, Toronto, Ontario. Georgian Bay Formation, Humber Member, late Ordovician, Katian. Length is approximately 2 feet long. This specimen is a fragment of the larger body.
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