Could you please help me to identify this potential fossil please? It is in flint, and was found just under the surface whilst digging in a field in Bledlow Ridge, Buckinghamshire. I've tried to research it but had no joy as yet. Anything you can tell me, I'd be very grateful. Many thanks, Kevin.
Interesting find - what your looking at is an internal cast where the original fossil has gone - if you look at the top of it in the first picture you can see something that looks like a fragment of the original shell.
I think the original fossil was an ammonite - does any of it appear on the reverse side of the block? If it doesn't its either a fragment of an ammonite or an uncoiled (heteromorph) ammonite section thats been later encased in flint/chert.