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935 Views 6 Replies Last post: Dec 5, 2013 12:13 AM by MikeHardman RSS
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Dec 1, 2013 9:25 PM

Help with ID

Hi all can someone please id this specimen.

I found this in my shed when i was making some room, I donot know were it came from (possibly the Holderness coast) or what it is so could you help and ID it please.

 

Tabfish

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    Dec 1, 2013 10:01 PM (in response to Tabfish)
    Re: Help with ID

    Tabfish,

     

    My first thought was cone-in-cone structure.

    But there's something not quite right for that - the concentric layering is too distinct.

    I'm also tempted to think 'burrow filling', but again, the layering is too good and not really the right geometry.

    Concretion? Doesn't feel right either!

    Root cast? Not usually as well layered...

    I can see your quandary!

     

    Any sign of sedimentary layering running across the concentric layers?

    Can you tell if the concentric layers are cylindrical or actually elongate cones? (your specimen may not be adequate to answer that)

     

    Mike

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        Dec 2, 2013 6:55 AM (in response to Tabfish)
        Re: Help with ID

        Tabfish,

         

        I don't know about being 'too good' to be a root cast...

         

        Another possibility is a dewatering pipe. I have seen such things in the Namurian of western Co. Clare in Ireland (part of my post-grad. work on soft sediment deformation). When sands/silts express contained water, it can come out in various ways, giving rise to such features as small-scale sandstone dykes and volcanoes. What I have in mind is a pipe feeding a sand volcano. They are usually only a few cm long, partly cone-shaped, and can contain concentric layering. But, again, yours somehow does not sem quite right. Also, I don't know if they've been recorded from your locality.

         

        I'd still lean towards root cast. Bear in mind at least some of the concentric layering could be diagenetic/concretionary, and it could be just the central (unlayered) part that represents the original root. Hence my asking if the concentric layering crosses the sedimentary layering.

         

        Mike

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          Dec 2, 2013 7:07 AM (in response to MikeHardman)
          Re: Help with ID

          Could it be the bottom of a bellemite?

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              Dec 5, 2013 12:13 AM (in response to Tabfish)
              Re: Help with ID

              Tabfish,

               

              It is definitely worth keeping, if only to go in the amusements box for unsuspecting visitors.

              ...From where you produce it and ask the visitor to ID it. If they say 'no idea', you can say 'well I can't give the game away'; if they give you a convincing ID... ...you can tell them 'well done', then go check it later

               

              Mike

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