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gill massey
WIN_20180808_15_01_09_Pro.jpg 
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MicroFossilMan
I don't think so, though I'm not sure what they are. Where did you find them? How hard is the stone?
MFM
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prep01
Hello Gill and welcome to the forum. Firstly, could you always let us know the location where they were found and add a scale to all photos (a ruler is best) and don't be mean with your photos - all aspects should be taken.
Having said that, sea molluscs which graze on microscopic algae etc on rocks and 'rasp' a feeding trail which is what you have here (modern) are worldwide. The small piece to the bottom right might be a small piece of a fossil bivalve.
Colin Huller
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gill massey
The stone which looks like it has a worm trail on it is in a hard stone and the small piece which looks like a leaf pattern is in a very thin silver of rock. I will take more photos in future and try to put them to scale. Sorry am new to this so a bit clueless. I found them at saltwick bay. Thanks for your help
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estwing
They don'l look like fossil to me, probably modern mollusc feeding trails, but they are beautiful and intriguing...
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prep01
Estwing - I did say the trails are modern.
Colin Huller
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TqB
They're worn, longitudinal sections of modern rock boring worm burrows, Polydora ciliata or similar.

Here are some fresher ones on a large belemnite:

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Tarquin
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MicroFossilMan
Is it purely a mechanical thing or do the little beggars secret "acid" or whatever? And what do they gain from it? Lime?
MFM
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TqB
Possibly both - "It has been suggested that burrowing is achieved by mechanical action of the chaetae, especially those of the 5th segment, but this is open to some doubt as chemical action may also be involved".

I guess they get a good, solid home. [smile]
Tarquin
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