Live in an area where fossils are common. Had a friend that swore he found a small dinosaur skeleton. Really looked like one, but a couple of other teachers and collectors told him no. He wouldn't believe us, took it to UT Austin and was very unhappy to find out that he had some Edwards Limestone that looked like it had once been alive. The moral? Go ask some real experts in the field. Yours lookes good, but who knows...