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Trigonia is a genus of extinct bivalve.

This species can be identified by it's ribbing. This species can often be found in mass 'Trigonia beds', where they are the main fossil evident. The fossil depicted was found on the Dorset oast. Trigonia lived in the Early Permian- Late Cretaceous about 298.9-66Ma

Trigonia

Trigonia - http://www.flickr.com/photos/qwertyqwertyqwerty/

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