I Found these in ossett, West Yorkshire, UK. They are carboniferous In age (if they are fossils). Is the one on the right a fish mouth plate? I found It in a huge clay hill, just next to where I find most of my petrefied wood pieces. I do find a lot of nice pieces of petrified wood in the clay though. So do you think it's a fossil mouth plate? Also, is the one on the leaft a bone fagment? When you look inside it looks like bone marrow or is it just the shape of the rock?