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I found this on the ground near Frome, Somerset. To my untrained eye, it looks like a scallop shell, but i'm not even sure if it's a real fossil. It still looks like a shell and not 'fossilised' rock. Extra info would be appreciated.
Yes, it is a fossil, and yes I think it is a scallop, sensu lato.
The easy guess would be Pecten, which are known from the shallow Jurassic sediments at Frome, eg.
http://www.brlsi.org/museum-collections/online-museum/fossils/21147 (no photo).
I am giving Pecten merely as a pointer to the ID; there are other genera in the Pectinidae (http://en.wikipedia.org/wiki/Pectinidae) and other related families.
I agree with Mike - the strong ribbing and 'wings' (seen best in the 2nd photograph DSC06664) suggests a scallop, Pecten-like, two-shelled (bivalve) marine organism.
Excellent. Many thanks to you both for the identification.