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Alex8584
Hello, 
Just wondering if anyone could help identify this specimen my wife discovered on the cotswold escarpment?
20200510_133256.jpg  20200510_133244.jpg 
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Barrow Museum
It is the partial impression of the shell of a bivalve, called Trigonia costata (name given to it in 1811 by the surgeon, chemist and palaeontologist James Parkinson, whose   name lives on in Parkinson's disease after he wrote a monograph on the shaking palsy!)  It is a species that appeared first in the Toarcian Stage (end of the Early Jurassic), but persisted into the Midde Jurassic - which is the age of your example, which I am assuming is from the Inferior Oolite Formation, given where you found it, meaning it was living some 170 million years ago.  Make an impression with plasticine to get a better idea of how it appeared in life.  A representative of the Trigoniidea family is still around today, living in the Sea of Japan.
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Alex8584
Thank you so much for your thoughtful and thorough reply.
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Dirty Pete
Doggerfan's post 'Bajocian Fauna from across the Channel' from some years ago displays some spectacular Trigonias amongst other things.
Here's a few examples if you're interested...

trig1.jpg 

trig2.jpg 

trig3.jpg 
I remember being green with envy

Pete.
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