Fossil Living Chamber

Discussion in 'Cephalopod Fossils' started by Architeuthoceras, Feb 28, 2005.

  1. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    This is the best I could do last weekend. Just the mud infill of the body chamber of a large endocerid, would have been about 4 to 5 feet long I guesstimate. A small peice of the endocones is visible in the first photo (upper right corner), with some mud filling the siphuncle at the end of the body chamber producing the nob. And an end view showing the shape of the shell and location of the siphuncle.
     

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  2. spartacus

    spartacus Haliphron Atlanticus Registered

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    Big Kev, never realised endocerids had knobs ! :shock:
    though it looks more like a rather attractive hammer to me ! :roll:
    sorry

    Keef
     
  3. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    It's the thing next too the head :wink:
     
  4. Phil

    Phil Colossal Squid Supporter Registered

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    Sorry Kevin, maybe I am being stupid but I can't see the siphuncle. Is it centrally placed?

    Great find.
     
  5. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    The yellow outlines the cast of the living chamber and the red outlines the cast of the siphuncle.

    Hope this helps :oops:
     

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  6. spartacus

    spartacus Haliphron Atlanticus Registered

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    methinks Big Kev has got "eagle eyes" !

    Keef
     
  7. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Here are some smaller examples with a few of the chambers preserved. The first pic shows the siphuncle filled to the tip of the hollow of the last endocone.
     

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  8. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    And another. No chambers on this one but the siphuncle filling show up good.
     

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  9. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Here are two casts of body chamber and siphuncle found in shale over the weekend. They are both showing the bottom side, hence the small trilobite mold in the upper pic is a mold of the top of the trilobites shell. There is also a graptolite laying along side the siphuncle in the top pic. Also in the top pic you can see a ghost of the phragmocone and chambers that dissolved probably before the surrounding shale turned to stone.
     

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  10. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Here is an internal mold of the body chamber and siphuncle inside an external mold of the shell. All trace of the shell material has dissolved leaving the internal mold and a hollow where the gas filled chambers and the shell material used to be. The shell in this example probably dissolved after the surrounding mud had turned to stone, so the hollow was preserved.
     

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  11. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    A few other small fossils found this weekend. A small Edriasteroid and a crinoid with the calyx. All Early Ordovician, Floian Stage, Zone I (Ibexian Series, Blackhillsian Stage in NA usage)
     

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  12. sorseress

    sorseress Colossal Squid Supporter

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    You had a productive weekend. Good finds.
     
  13. hallucigenia

    hallucigenia O. bimaculoides Supporter

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    Wow, these are amazing! Where did you collect them?
     
  14. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    They all were found in the informal Calathium Calcisiltite Member of the Fillmore Formation, in the Ibex region of western Utah. Of course it is a secret spot and if I told you exactly where it was I would have to make a call and have something done about it :wink:

    By the way, they were not collected, just photographed in the field and marked with a GPS.
     
  15. Phil

    Phil Colossal Squid Supporter Registered

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    Congratulations Kevin, stunning finds. Might be a little far for me to go and have a look in your 'secret location' though! Any idea as to the species?
     
  16. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    The first two I would just have to say Protocyclocerid, could be either Protocycloceras or Catoraphiceras but I cant see the sutures, Catoraphiceras would have a ventral saddle.
    The big one is probably some form of Ellesmerocerid.
     
  17. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    An ammonoid body chamber found last weekend. An Arctocerid probably churkites. Like the others, the body chamber filled with mud that partially lithified, protecting it from the crushing weight of the sediment. Unlike most of the others, the phragmocone left an impression in the soft muddy bottom which also partially lithified, or at least got hard enough to protect it.

    Also a photo of Jim Jenks, a fellow triassic ammonoid enthusiast.

    and yours truly:old:
     

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