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736 Views 4 Replies Last post: Feb 21, 2014 11:12 PM by Tabfish RSS
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Feb 18, 2014 9:56 PM

Any idea on type of fossil?

Found curious little fossil while out on the beach today at Happisburgh in Norfolk.

Was in the low layer clay type mud. Thinking type of nut?

Also was some larger around 5- 6 inch type fossils with a flakey type of shell.

Any idea appreciated.

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    Feb 19, 2014 6:50 AM (in response to Alan c)
    Re: Any idea on type of fossil?

    Alan,

     

    The two main possibilities are:

    - nut

    - concretion

     

    You may be able to see more in your specimens than I can see in your photos.

     

    Some questions:

    1. Are there any ribs around the outside (like lines of longitude)? Many nuts have two or three (or more).

    2. Is there a scar at one end where the ribs (if any) meet? That would be the stem attachment.

    3. Can you see any surface texture? (Such as you might see on a modern nut.)

    4. Can you see any cellular structure in the wall? Concretions would not have that, though sedimentary grains could give a similar appearance.

    5. Is it symmetrical in any sense?

     

    If 'yes' to one or more of those, it is probably a nut.

    If 'no', it is probably a concretion.

    There is a bit of a grey area - where it could be a cast of a nut - which would have no cellular structure, but might display some of the other nutty features.

     

    I have not be able to find definitively IDd nut fossils from Overstrand. But that does not mean they don't exist.

     

    Mike

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        Feb 19, 2014 8:30 PM (in response to Alan c)
        Re: Any idea on type of fossil?

        That doesn't really help me much, but thanks for the photo anyway.

         

        With some things, we have to accept ambiguity; or embark on deeper research, with no guarantee of getting a clearer answer at the end of it all.

         

        Mike

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        Feb 21, 2014 11:12 PM (in response to Alan c)
        Re: Any idea on type of fossil?

        Hi Alan

        We find these on the Holderness as well, I think it's a concretion with variable preservation on the outside.

        Sometimes we find these with no cracks on the surface and sometimes we find them were you only have to 'tap' them and the coating falls away.

        Could be the outside has a large pyrite content and is 'rotting' leaving the harder inner nodule that is made of something different.

        Nice find.

         

        Tabfish

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