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fossilsonwheels posted a topic in Fossil IDWhen I first set out to collect Dinosaur fossils, a fossil dealer with a long history in the industry and from whom I had purchased shark fossils from had this listed for sale. It was sold as a Troodon formosus ( I am aware it is an invalid taxon). When I committed to purchasing this, i was unaware that only Troodontid teeth had been found in Hell Creek and I tended to believe dealer ID's. I do not regret the purchase. It is a great little bone to have in our education program and it was not expensive. We want to cover Troodontids in our education program which is why I bought this. It was cheaper than a tooth. It was also a good lesson to learn early on and without a significant financial investment. I do my homework know before purchasing a dinosaur fossil and if I have questions, I put it here. It seems unlikely that that the dealer ID is correct just based on the lack of Troodontid bones that come from Hell Creek. I want to know we have and be accurate in what we present to kids so I have put some effort into figuring this out. It is a very small vertebra as you can see in the pictures. I did find some small theropod caudal vertebrae that look similar including a Troodontid. I have done some homework on this and tried to figure it out but I can not get much further on my own. All I can say for sure is that is does not appear to be a fish or mammal and I do not think it is a crocodilian either. Any thoughts or information would be helpful !!