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256 Views 3 Replies Last post: Feb 12, 2014 10:22 PM by MikeHardman RSS
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Feb 10, 2014 12:31 PM

fish??

lilly fossil 083.JPGlilly fossil 084.JPGlilly fossil 089.JPGlilly fossil 090.JPGlilly fossil 096.JPGlilly fossil 094.JPG

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    Feb 10, 2014 1:41 PM (in response to kate)
    Re: fish??

    Kate,

     

    1. Sandstone with clasts (lumps) of mudstone or coal or coal-ish plant remains.

     

    2. The thin darkest mark(s) could be plant fossil; difficult to make out;

         the brown mark(s) are probably not fossil.

     

    3-5. Ferric iron oxide staining in sandstone. Iron salts dissolved in water saturating the rock gets deposited and redissolved in pulses, as conditions change, leaving different concentrations of iron oxide crystallizing in the pore spaces in the sandstone (great simplification, but I hope you get the idea). This sort of thing can happen soon after sediment starts to turn to rock, or very much later (modern day). Have a read of this on 'Liesegang rings' - http://en.wikipedia.org/wiki/Liesegang_rings_(geology)

     

    6. Ironstone concretion (see other post this afternoon)

     

    Mike

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    Feb 12, 2014 9:12 PM (in response to kate)
    Re: fish??

    Hello Kate

    Is the 6th image a bivalve?

    Lots of interesting finds, well done.

     

    Tabfish

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