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1361 Views 5 Replies Last post: Jun 7, 2011 5:41 PM by Gabby RSS
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Jun 7, 2011 5:01 PM

Answered - flint echinoid and crinoid? impression

Found this today while out scanning the beach again at Pakefield, no idea what either imprints are. Did find some Devil's Toenails and shell imprints too but no idea what this one (2) is.

Gabby

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    Jun 4, 2011 7:07 PM (in response to Gabby)
    Re: 2 imprints on the same stone,interesting...

    Very nice - your pictures 1 and 3 look like it could be part of the stem of a crinoid - a picture of the end would be helpful?

     

    Your other two pictures are of a really good impression of an echinoid (sea urchin) spine - nice big spiky one.

     

    Regards,

     

    Ryan

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        Jun 4, 2011 9:56 PM (in response to Gabby)
        Re: 2 imprints on the same stone,interesting...(Ryan)

        Hi Gabby,

         

        What I was looking for in the end on shot was a colour contrast to the surrounding chert which I think you can see. I think I'll stick with crinoid - as a basic rule of thumb if you see a long shape made up of lots of different segments then its likely to be a crinoid.

         

        Regards,

         

        Ryan

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    Jun 7, 2011 5:01 PM (in response to Gabby)
    Re: 2 imprints on the same stone,interesting...

    Hi Gabby and Ryan,

     

    I agree that the first photos show the impression of an echinoid spine. I've attached an info sheet about echinoids for you. It's a slender, tapering spine, rather than more blunt and club-shaped, so I think would be from something like the echinoid Tylocidaris.

     

    The other markings, I'm not sure if these are crinoids? If you look at the end on view (first of second batch of photos), the line of the possible crinoid seems to blend into the surrounding rock in a way I wouldn't expect. To be honest though, I don't have any better ideas than crinoid and Ryan you'll spot on that a long segmented shape is likely to be crinoid!

     

    By the way, Im not sure if you are aware that the rock here is flint, which was formed in the Upper Cretaceous towards the time of the dinosaurs, around 85-65 million years ago, so this is the age of your specimen.

     

    All the best,

     

    Luanne

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