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820 Views 3 Replies Last post: Apr 11, 2012 9:42 AM by ckmerlin RSS
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Apr 7, 2012 9:30 PM

fossil in spain.

we found this fossil in spain,it was on seagul island,any idea what it is.
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    Apr 8, 2012 9:36 AM (in response to patrick)
    Re: fossil in spain.

    Hmmm very interesting ! the concentric rings in the middle remind me of the holes seen at mud geysers but I dont know enough about the geology of seagull island (never heard of it ?) to say that is what it is , also some jelly fish fossils have this shape but they are quite rare and I dont think they would have fossilised in this rock as it looks quite disturbed ( in a sedimentary context) .Another possibility is some kind of algal/stromatolite formation. I cant tell what type of rock that is, it looks like a fine grained sedimentary rock ?

     

    p.s attached photo of mud geysers for comparison (from google search not my own photo)

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        Apr 11, 2012 9:42 AM (in response to patrick)
        Re: fossil in spain.

        Another possibility is a worn Favosite coral they can form these concentric rings

        I didnt think of it before but it occured to me earlier today

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