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173 Views 1 Reply Last post: Feb 11, 2014 6:14 AM by MikeHardman RSS
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Feb 11, 2014 5:17 AM

Fossil cocoon?

Found underneath cliff on beach, fossil or rock?

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    Feb 11, 2014 6:14 AM (in response to Jessica84)
    Re: Fossil cocoon?

    Jessica,

     

    A coccoon would be sooo difficult to fossilise!  I think not.

     

    The overall appearance suggests a bone, like a femur, with the rounded head at the end

    http://healthfavo.com/femur-anatomy-on-healthfavo-com.html

     

    But I am fairly sure it is just a piece of rock.

    It is clearly very fine-grained, which makes it difficult to ID the rock type: could be mudstone, could be rhyolite; other possibilities. However, much of the structure is due to narrow sedimentary layers and veins of a slightly harder mineral, quite possibly quartz.

     

    The dark rhombic shape show in SAM_0771.JPG could be a pyrite crystal.

     

    The overall colour (including the mottling) is fairly unusual. I would be thinking of arid sedimentary environments, or hydrothermal metamorphisis as possible explanations.

     

    Mike

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