GuidesMagazineShopBuy FossilsJoin Hunts
Just wondering if anyone could help identify this specimen my wife discovered on the cotswold escarpment?
20200510_133256.jpg  20200510_133244.jpg 
Quote 0 0
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.
Quote 0 0
Thank you so much for your thoughtful and thorough reply.
Quote 0 0
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...



I remember being green with envy

Quote 1 0
Write a reply...

Discussions on fossils, fossil hunting, rocks, locations, and identifying your finds.
(C)opyright 2019 - UKGE Ltd and UK Fossils - Contact us