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328 Views 1 Reply Last post: Jul 25, 2013 8:38 PM by MikeHardman RSS
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Jul 25, 2013 5:22 PM

Fossil Identification

Hi, Any help with the identification of this fossil would be greatly appreciated - found on a beach near Bridport by my Grandson Liam

IMAG2113.jpg

IMAG2114.jpg

IMAG2116.jpg

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    Jul 25, 2013 8:38 PM (in response to Mart)
    Re: Fossil Identification

    Mart,

     

    If it was a fossil, it should have some surface features indicative as such (we cannot make that statement absolute because some soft-bodied organisms with featureless exteriors do, rarely, get preserved as fossils).

    The only surface feature I see is a faint circle, which is suggestive of a sedimentaty layer intersecting the globular object. If that interpretation is correct, the object is most probably a concretion. That might have a fossil as its nucleus, but it is mainly mineral rather than fossil.

     

    I know it looks 'organically' round. We often see concretions of such a shape. Some are egg-shaped, which also causes folks to think they are fossils. In most cases, it is just Nature playing games with your mind.

     

    The little one to the side... That's probably of the same origin.

     

    Please see my explanation of concretions at the end of this topic

    - http://www.nhm.ac.uk/natureplus/message/27257#27257

     

    http://en.wikipedia.org/wiki/Concretion

     

    Also have a look at this:

    Bowling Ball Beach, Mendicino, California

    - http://en.wikipedia.org/wiki/File:Bowling_Balls_Beach_2_edit.jpg

    (due to a quirk of the URL, the link may not open just by clicking on it - you may have to open it in a new window/tab)

     

    As regards the locality of the specimen, concretions are common in coastal exposures in Dorset, especially the big ones in the Bencliff Grit (6ft across) further east - http://www.southampton.ac.uk/~imw/osben.htm

    (search for 'concretion')

     

    Mike

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