I agree the one you cited is a fake, and if I can get round to it I'll remove it. But it does look like an ear ;)
I tried again today, but it really is so dark in that part of the woods that the results were no better. All the pics are here. The marks are on the pointyest of the two pointy stones on the right of the group pics.
http://smg.photobucket.com/albums/v239/slumpy_uk/walderslade%20woods/