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205 Views 2 Replies Last post: Jun 6, 2014 5:21 PM by alisa RSS
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Jun 6, 2014 3:13 PM

Fossil? Cardigan Bay, Wales

I found this lying on the seashore under the cliffs between Aberystwyth and Borth. Its about the size of a mobile phone. It looks like a fossil of some kind of grass in slate/mud stone? Does anyone know what it might be or how old? I'm intrigued..... any response greatly appreciated, Thanks

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    Jun 6, 2014 3:46 PM (in response to alisa)
    Re: Fossil? Cardigan Bay, Wales

    Tricky to say...

    There are both fossils (mainly plants) and minerals that can look like that.

    My best guess is that the rock fractured, that happening in a such a way that a frondescent pattern formed (it is due to the nature of crack propagation). The fracture then became filled with (pale) minerals - turning it into a vein., Then much more recently, the rock split along that vein and erosion wore away some of the mineral, leaving just a smear, preserved in the slight relief of the earlier frondescent fracture pattern.

     

    Mike

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