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Char Le Mar
Hi all,  we found this year's ago and subsequently forgot all about it and where we found it.  Definitely on the coast of the UK. I know that's not very helpful.  

This thing seems to be encased in a bark/skin  like layer of grey ridged material  which is covering a second brown smooth layer.  Viewed from end on it looks to have a "fish shaped" profile that is 3 CM at it's  widest point. Along each side,  there's a line running along the middle length which makes it look "leaf-like".

Apart from an initial water wash to remove dirt,  we've done nothing to it IMG_20200523_093014.jpg  IMG_20200523_093057.jpg  IMG_20200523_093158.jpg 

Does anybody have any clue as to what this is?  After trying to google pictures of similar items without success, we're  coming to the experts. 

Thanks, 

Charlotte
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Barrow Museum
Charlotte,
This is a bit tricky, as so much of it has been eroded away.  But my suggestion is the bivalve Pinna, also known as a Fan Shell.  This has been around for at least 200 million years (since the Jurassic) and a species of it is Britain's largest extant bivalve shell.  I have seen them over a foot long from British waters.   If I am right, yours shows the join between the two valves and the fairly distinctive sloping shell ornament.  As these lived embedded quite deeply in soft sediment, they are fairly commonly fossilised after the creature died, and remained in their vertical life position too.  Curiously, it is the only bivalve with a flexible shell, enabling it to close the exposed wide upper aperture for protection.
I attach a photo of a Jurassic example (which yours rather resembles) from the internet.
I can't help you identify the locality - it could be almost anywhere along the Jurassic coast of Dorset or the Yorkshire coast as well as a number of smaller stretches of the British coastline where Jurassic sediments crop out.

Pinna.jpg 
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prep01
Hello Charlotte and welcome to the forun. In short - I agree with BM.
Colin Huller
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Char Le Mar
Thank you for your replies. Following your comments,  I goggled Pinna examples and found this link -  https://fossil.15656.com/2019/05/31/the-prismatic-layer-of-local-fossil-pinna/ and the similarity of the specimens shown there to ours seems to confirm it, even down to the needle like structure of the "prismatic layer".  1590311960084_prismatic layer.jpg 
Managed to take this after the original post. 

Thanks again,  Barrow Museum and Colin. 
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