Guess What? Thing 2

Discussion in 'Cephalopod Fossils' started by Architeuthoceras, Oct 22, 2006.

  1. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    What is this a fossil of ? it is cephalopodan. :smile:
     

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  2. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    a few more pics.
     

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  3. Jean

    Jean Colossal Squid Supporter

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    no idea....but in that last shot it looks like a ginormous statolith!

    J
     
  4. Tintenfisch

    Tintenfisch Architeuthis Staff Member Moderator

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    Or eye lens... but 11cm would be huge, plus the lenses aren't concave on the inner surface... :hmm:
     
  5. Phil

    Phil Colossal Squid Supporter Registered

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    Looks more like bone to me, but I'm sure it's not! It's not a huge ammonoid spine base or something like that?
     
  6. cuttlegirl

    cuttlegirl Colossal Squid Supporter Registered

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    My only thought is that it is a really big protoconch... or maybe an aptychus. Once again, just wildly guessing.
     
  7. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Phil got it! :notworth:
    I think, basically just guessing, that it is a node (can't really call it a spine) on the shell of a coiled nautiloid. It is from the Mississippian Chainman Shale where I find a few small coiled nautiloids. This is the thickest piece of shell I have ever found though. Below are a few pics of some of the small nautiloids showing the nodes running along the flank close to the umbilical shoulder. Doing a few calculations on the ratio of diameter/shell thickness of the smaller ones I come up with a diameter of between 450mm and 1050mm (probably closer to the upper figure, shell thickness was greater on the venter where I had to measure some than on the flanks where the nodes are), making it a pretty big shell. :shock:
     

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  8. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    a few more, and a closeup of something growing on the shell, probably a bryozoan
     

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  9. Jean

    Jean Colossal Squid Supporter

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    I agree about the bryos they look very like ones we get over here growing on shells, rock, seaweed.........etc!

    J
     
  10. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Thanks Jean, I guess I really should go and take a good look at the ocean one of these days and see just how some of the things I find as fossils actually live, and how they look alive. :oops:

    Kinda hard for an old desert rat though. :wink:
     

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