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Zinga
Hi there, I wonder if anyone may be able to tell me what these fossils are from Abereiddy Bay. They look
like a possible trace fossil but really not sure as Im not familiar with Ordovician fossils.

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Dirty Pete
Hi Zinga,
Maybe lithic clasts of darker mudstone? that have been incorporated into a lighter mudstone/limestone? through some sedimentalogical process.

Pete.
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Zinga

Hi Dirty Pete
Thats something I hadn’t considered. The only problem with that is two of them are on broken edges and they have no depth to them, they are just surface marks. I did wonder if they may have been trace marks left by trilobites but all of the pictures I’ve seen of those still carry some sort of discernible pattern from the underside of the trilobite, these on the on the other hand are completely smooth just like the impression that might be left by a leaf with no veins or stem if you can imagine what I mean as an illustration only as I am aware there would have no leaves at this time. 

Zinga

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Zinga
Hi Dirty Pete
that’s actually something I hadn’t considered. The only problem I see with that is that two of the impressions are on broken edges and there is no depth to them they are just purely surface shapes. I did wonder if they may have been trace fossils left by trilobites but all the pictures I’ve seen of such things still carries some sort of mark left by the underside of the trilobite where as these are completely smooth.

Zinga
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Dirty Pete
Hi again Zinga,
Not sure why a trace fossil would be a different colour/texture from the enclosing/host rock and they don't look like carbonised remains (too homogeneous).
Pete.
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