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143 Views 2 Replies Last post: Aug 10, 2018 4:36 PM by Dirt fisher RSS
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Jul 29, 2018 6:24 PM

Coprolite?

Hello.

 

This was found on a Norfolk beach today and was wondering if it is fossilised poo?. It certainly looks like it but it is very heavy for its size.

 

Thanks for looking

 

Steve.

  • Currently Being Moderated
    Jul 30, 2018 10:21 AM (in response to Dirt fisher)
    Re: Coprolite?

    Hi - this is FeS2 - iron pyrite (Fool's Gold).  Formed by bacteria in the seabed - probably Late Cretaceous.

     

    There is a connection with organic matter and sometimes pyrite can replace fossils (see below).  To ID a coprolite one really needs to see fragments of other organisms within, or a spiral mark (shark).  Yours probably replaced crustacean burrows in (I assume) the Chalk sea bed. 

     

    A fresh surface will show steely grey or brassy radiating crystals sometimes called "Marcasite".

     

    Lft Clk to enlarge

    Pyrite for CHCC.jpg

    Capture.JPG

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