I found this lying on bare earth, probably having been unearthed by cows which graze the banks and river dyke. This was on the Old West river near it's junction with the Great Ouse four miles south of Ely, Cambs. The intriguing thing is the molar like appearance of the unbroken end of the tusk, tooth, horn or claw? The measurement of the outer curve is 17cm. I am amazed it's in such good condition as it has the feel of a soft but brittle clayey rock- so is a fossil and not a preserved bone. I cannot imagine what animal it came from and would be delighted to find out.
Nice find - its actually an outer section of an ammonite - one end has the connections to the next chamber within the ammonite preserved. From where you found it its probably been transported by a glacier from the older rocks to the northwest.
That's superb! I would never have thought of a section of Ammonite but I can see it clearly now. I will keep my eyes open when next on the Old West river. And thanks, Natural History Museum, for the NaturePlus forum.