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444 Views 14 Replies Last post: Aug 10, 2018 9:59 AM by garymunro RSS
Currently Being Moderated

Jul 19, 2018 12:49 PM

Is this a fossil or preserved oyster shell?

P1040338.JPGI found this many years ago whilst operating an excavator in Oxfordshire.

P1040336.JPG

 

Message was edited by: garymunro

  • Currently Being Moderated
    Jul 19, 2018 5:22 PM (in response to garymunro)
    Re: Is this a fossil or preserved oyster shell?

    This is a fossil oyster - maybe from the Upper Jurassic Oxford Clay - possibly Gryphaea dilatata

    If so, then about 160 million years old.

    If you can give the exact location I can post the relevant geology map.

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      • Currently Being Moderated
        Aug 7, 2018 6:37 PM (in response to garymunro)
        Re: Is this a fossil or preserved oyster shell?

        If you mean near Chieveley (from which I am sending this) then your fossil is not in place.  All the rocks in this area are Upper Cretaceous Chalk or superficial deposits derived from it.  There are no extraction points so I think you have the wrong location info.  Please try again and mark it on a snip of a Google map - thanks

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          • Currently Being Moderated
            Aug 8, 2018 8:35 AM (in response to garymunro)
            Re: Is this a fossil or preserved oyster shell?

            If was was excavated in situ from bedrock then it must have come fom the Oxford Clay (OC on the map). Otherwise it had been dumped by man or transported by rivers during and after the Ice Ages..  Was it a deep excavation with dark grey sticky clay or was it gravel?

             

            Lft Clk to enlarge

             

            Bedrock Geology Map:-

            Capture.JPG

            Superficial Deposits:-

            Capture.JPG

             

            Most of the gravel extraction was in the Theale-Reading area and the Staines-Heathrow area further south and east

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  • Currently Being Moderated
    Jul 25, 2018 3:51 PM (in response to garymunro)
    Re: Is this a fossil or preserved oyster shell?

    Please mark this as Answered - thx

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