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Hi all. I'd like to begin by thanking the members of this forum for the profound wealth of knowledge that you all have shared with me during my search for further understanding of dinosaurs, fossil collecting, and fossils in general. Prior to joining, I was a longtime lurker that regularly referenced this forum and its many posts to answer countless questions that I had, and I continue to reference it! The information contained on this site is invaluable. I would especially like to thank @Troodon for his amazing guides and detailed write-ups, such as the case made for Nanotyrannus. That really settled the debate for me and convinced me that Nanotyrannus is indeed a separate genus. So thank you all! Now, with that out of the way, I'll get to the point of this post. I recently got my feet wet in this hobby and did what I'm sure MANY beginners have done before me. I began by acquiring a fossil of the most well-known dinosaur, and my personal favorite, Tyrannosaurus Rex. Specifically what was advertised as a partial T-Rex tooth. I can't afford a complete tooth at the moment, so I settled for the next best thing. Based on everything I've learned so far regarding T-Rex teeth and how to ID them, its characteristics seem to lean towards being a Rex tooth, but I'm by no means an expert on the subject, so I'd like to call on the many members of this forum that have more experience than I do and ask if they would be so kind as to share their opinions based on the photos and information provided. So as for the tooth's information. It's a partial tooth that measures 1.38 inches long, and the seller stated that it was discovered in the Hell Creek Formation of Powder River County, Montana. It does seem quite robust, and its shape and relative size seem consistent with Rex teeth. It also has a pretty round cross section. The serrations also seem to be pretty in line with Rex teeth, but I don't know if they provide any clear differential to typical Nano serrations. Photos taken by both the seller and myself have been attached. Thanks in advance for any help/opinions provided!

I just got this tooth in the mail today. It’s a partial tyrannosaur tooth, and it’s from the Judith river formation. I know it was found in Montana, but that’s it for locality. Despite it being partial, it’s approximate 1.25 inches long, and it looks to me like it would have been much larger if complete. I know that Daspletosaurus and Gorgosaurus teeth are indistinguishable, and that you can really only call teeth around 3.5 inches Daspletosaurus. I was wondering if it would be safe to assume that this is a partial Daspletosaurus tooth because the small piece I have is already over an inch, and it looks to me like it could easily have extended an additional 2 inches.

Picked up the below partial tooth on the first trip to the Peace River for the new season on Friday. Was pretty sure it was a partial Mastodon tooth. After searching numerous images I am now thinking it could be Gomph. Any help with a positive ID would be greatly appreciated. Sorry the ruler became blurred as the focus was concentrated on the tooth. Size is 2" x 2" by 2.5" high.