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2174 Views 12 Replies Last post: Feb 23, 2014 9:51 AM by AnimalGirl RSS
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Feb 2, 2014 9:33 PM

Mappleton today

I found this at Mappleton and was wondering if any one knew what it was?

 

Tabfish

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  • Currently Being Moderated
    Feb 3, 2014 7:20 AM (in response to Tabfish)
    Re: Mappleton today

    Tabfish,

     

    Please could we have some more photos - other sides/angles. With scale (I appreciate your hessian sacking gives a clue.)

     

    As it is, I can't tell if the shapes we see on the (curved) surface as connected or separate, nor whether they are manifestations of a wavy surface or cylinders.

     

    Also, under a hand lens, can you see structure in those lines? (ignoring the fracture surface itself).

    I'm interested to know if you see lines running across or along (or maybe some of each orientation).

     

    Mike

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      • Currently Being Moderated
        Feb 4, 2014 9:33 PM (in response to Tabfish)
        Re: Mappleton today

        Re the preceding post/image (not the original specimen in this discussion):

         

        I think I can see fine ridges running across the back of that recess...

        If true, that suggests it is a mould of a fragment of a large bivalve (large enough not only for the evident thickness, but also the almost lack of curvture). The fine ridges represent calcite fibres, and seen in a section like this are commonly referred to as a palisade. Here's a clear example:

        - http://northislandexplorer.com/fossils/cretaceous/inoceramus.htm

         

        Mike

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  • Currently Being Moderated
    Feb 23, 2014 9:51 AM (in response to Tabfish)
    Re: Mappleton today

    Hi Tabfish,

    You are soooooooo lucky! You always find interesting rocks! Are you a fossil expert because if you are I would make you help me with MY fossil identification! :)

    AnimalGirl

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