Possible Ammonite

Discussion in 'Cephalopod Fossils' started by Pr0teusUnbound, Nov 14, 2012.

  1. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    i found this thing in a chunk of limestone while trying to chisel out a chert lens. im pretty sure its a cephalopod mold, but can anyone tell what species it is?

     

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  2. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Sorry, I just can't see what it is. :oops:
     
  3. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    really?:hmm: this is one of my most popular pic on deviantart, so i though it was legible. let me highlight the interesting parts so you can see what im seeing.

     

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  4. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    I see now :old:

    It does look like an ammonoid. split right down the middle. The septa are showing and part of the shell wall, and the umbilicus would be where you show it, but it is not there. It would be very difficult to assign it to a species as the sutures are still buried and any ornamentation on the shell is not visible. The septa near the suture are more in the shape of the suture, but as you move toward the center of the shell the septa become more simple, almost to the point of looking nautiloid like. I think this is how your specimen is, you can see some of the curvature of the septa but not the sutures.
     
  5. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    not to revive a dead thread, but ive found a few more potential cephalopods molds with similar structure. im posting them here to avoid saturating the Fossil Ceph ID page with my posts.

    1a. 1b.

    2. 3.
     

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  6. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    Sorry, but I just can't see anything in those rocks that looks like a cephalopod.
     
  7. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    sorry, i could have sworn the dark lines were septal impressions
     

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  8. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    The dark lines in 1a and 1b are too thick, and along with 2, they don't have any sign of the shell wall. If I could see that they were not just squiggly line floating in space... then maybe. :oops: The piece between your fingers in 3 at least has equally spaced squiggly lines.
     
  9. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    im starting to cool off on the ammonoid diagnosis for the squiggly lines. i was doing some reading on crustaceans from ohio and found that the tail of the decapod Palaeopalaemon looks rather similar to the pics in #5.

    Palaeopalaemon is in orange, the tail in red
     

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  10. Usktang

    Usktang Larval Mass Registered

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    You need to bit of lab tests to know what exactly it is
     
  11. Pr0teusUnbound

    Pr0teusUnbound GPO Registered

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    :sleeping:... :shock:!

    what kind of lab tests?
     

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