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1388 Views 25 Replies Last post: Feb 4, 2014 8:36 PM by Tabfish RSS
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Jan 13, 2014 11:14 AM

what is this? large imprint

hi this was found on whitby bay underneath some boulders just wondered if anyone can help me id it?

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    Jan 13, 2014 12:13 PM (in response to starburst1812)
    Re: what is this? large imprint

    Judging from your photos, I'm pretty sure it is fossil, not modern.

    It is either:

    - a bryozoan mat, or

    - a leaf

     

    If it has a rectangular structure within the overall radiating structure, it is a Bryozoan.

    Here's a fossil showing that rectangular structure well

    - http://www.fossilmall.com/EDCOPE_Enterprises/invertebrates/invert72/invfossil72.htm

     

    This photo of a modern bryozoan mat called broad-leaved hornwrack (Flustra foliacea) at Whitby also shows the characteristic rectangular structure

    - http://1.bp.blogspot.com/_D_IGXhFRRsM/TTrYvCI3L4I/AAAAAAAAAyM/1I92VAQ4Xzg/s400/DSCF3020a.jpg

    (from http://whitbypopwatch.blogspot.com/2011_01_01_archive.html)

    Another example

    - http://www.nhm.ac.uk/nature-online/species-of-the-day/collections/collecting/flustra-foliacea/

    Although it is often mistaken for seaweed, it is rough to the touch.

    That's just to get your eye in on Bryozoans. Like I say, I am pretty sure yours is fossil.

     

    If it is a plant, we'll have to think some more (Jurassic plant fossils have been found at Whitby Bay).


    Please get back to us!

    Oh, and some close-up photos (including a scale) would be useful, so long as you can get them in focus.

     

    Mike

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    Jan 13, 2014 9:42 PM (in response to starburst1812)
    Re: what is this? large imprint

    Very nice find starburst1812

    It is the side of the outer whorle of a Lower Jurassic - Upper Lias ammonite called Phylloceras hetrophyllium, these ammonites are amongst the biggest you can find if you are lucky enough to find a whole one around Whitby.

     

    Tabfish

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      Jan 14, 2014 9:41 PM (in response to starburst1812)
      Re: what is this? large imprint

      Hi starburst1812

      Hope it's ok but I found something similar to your specimen tonite in my shed.

      I will post some more images separately because it's easier for me to explane what they are.

      The first is a view from the side of something like yours that has been in my shed for a while.

       

      Tabfish

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        Jan 14, 2014 9:45 PM (in response to Tabfish)
        Re: what is this? large imprint

        A closer look at the surface, you can see a ammonite inside of it, just popping through the rock.

        Just below the middle.

         

        Tabfish

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          Jan 14, 2014 9:49 PM (in response to Tabfish)
          Re: what is this? large imprint

          I was very lucky to swap for this specimen, it's12in/30cm polished up with all of the ribs removed.

          Pride of my collection.

           

          Tabfish

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            Jan 15, 2014 6:51 AM (in response to Tabfish)
            Re: what is this? large imprint

            That's a cracker, Tabfish!

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              Jan 15, 2014 9:17 PM (in response to starburst1812)
              Re: what is this? large imprint

              Don't forget starburst - if you found a partial fossil Phyllo then there is a good chance you were in the right area to find a full one!

              Just get the tides rite and the cliffs are very dangerous around Whitby.

              Look forward to seeing some more of your finds.

               

              Tabfish

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                  Jan 16, 2014 9:35 PM (in response to starburst1812)
                  Re: what is this? large imprint

                  My family and I has spent many happy times on the Isle of Wight and we have made some friends there, I can only say we wish we were there now.

                  Have a great holiday and please show your finds on here.

                   

                  Tabfish

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                    Jan 30, 2014 11:58 AM (in response to Tabfish)
                    Re: what is this? large imprint

                    starburst1812,

                     

                    I know you said Whitby Bay and 'under some boulders', but please could you give me more detail on the location (if possible). Specifically:

                    - by 'under some boulders', did you mean loose? - or was it in the bedrock?

                    - whereabouts around the bay (grid ref, some landmark that I could locate on a map, etc.)

                     

                    Also, you could go here

                    http://mapapps.bgs.ac.uk/geologyofbritain/home.html,

                    click on 'Go to location' (upper right), enter Whitby as location,

                    and see if you could give location information in terms of the geology.

                    You'll have to play around to get the hang of how the site works, eg. click anywhere and you'll get a popup regarding the geology at that point.

                    This might enable you, for instance, to tell us if the spot was in the Saltwick Formation And Cloughton Formations, or Whitby Mudstone Formation, or Mulgrave Shale Member.

                     

                    I am in contact with the advisory staff at the Angela Marmont Centre, who have requested this loation information (but are extremely short-staffed). I hope they, in collaboration with a palaeo, will be able to provide some useful insight. I would, of course, post that here.

                     

                    Mike

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                        Feb 4, 2014 3:52 PM (in response to starburst1812)
                        Re: what is this? large imprint

                        Ah - that's right where the stratigraphy changes in a short distance. To paraphrase the info from the BGS map:

                         

                        There are four formations, all in the Jurassic:

                        - Cloughton Formation - Sandstone, Siltstone And Mudstone, ~168-172ma

                        - Eller Beck Formation - Mudstone, Sandstone And Ironstone, ~168-172ma

                        - Dogger Formation - Sandstone, ~172-176ma 

                        - Whitby Mudstone Formation - Mudstone,  ~176-183ma

                         

                        Setting: shallow seas. These rocks were formed in shallow seas with mainly siliciclastic sediments (comprising of fragments or clasts of silicate minerals) deposited as mud, silt, sand and gravel.

                        Local environment previously dominated by swamps, estuaries and deltas.

                         

                        However, was that boulder on the beach (or a bit inland)?

                        And was it in the bedrock (or loose)?

                        If so, we're dealing with the Whitby Mudstone Fm.

                         

                        Once I have your answers, I shall email my contact...

                         

                        Mike

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