http://www.askabiologist.org.uk/answers … p?id=10957

Here are more photographs as per request. It is triangular.

Post's pictures

IMG_20140604_111217859 (2).jpg, 185.3 kb, 403 x 532

IMG_20140604_111451758 (2).jpg, 397.13 kb, 450 x 666

IMG_20140604_112519976 (2).jpg, 153.82 kb, 614 x 300

Hmm, to be honest I'm still a bit stumped, but the structure seems a bit more similar to a front centre claw of a brown bear than that of a badger (the front claws are longer and less curved). However, that still doesn't seem quite right... the wear facet on the top of the point is odd and makes me want to suggest something that used knuckle-walking or similar locomotion - like a large armadillo or (more unlikely) something like a Shasta ground sloth. How old was this midden?

After a lot of consideration, I think that this may actually be the dorsal fin spine of a spurdog shark. Completely in the wrong area before!