Sergiorex Posted September 22, 2022 Share Posted September 22, 2022 Hello, saw a few interesting things for sale. The first one is claimed to be a partial Tyrannosaurus rex skull from hell creek formation, locality is in image measures 12 cm-10.5 other 2 are both claimed to be partial limb fragments though I have doubts it can be narrowed to be from Tyrannosaurus rex. One is 2 and a half inch the other is 2 inch. I know that they say hell creek formation Wyoming which is weird. However I think some of hell creek form is in Wyoming? I would appreciate any help in verifying whether the items are identified correctly and if not what they should be described as. Link to comment Share on other sites More sharing options...
Troodon Posted September 22, 2022 Share Posted September 22, 2022 Unless the bones were removed from a known T rex skeleton there is no way to ID these fragments. Bones dont even look like theropod. The Wyoming bone is most likely from the Lance Fm 2 Link to comment Share on other sites More sharing options...
Sergiorex Posted September 22, 2022 Author Share Posted September 22, 2022 Oh… is there a way to differentiate between theropods and herbivores? Link to comment Share on other sites More sharing options...
hadrosauridae Posted September 23, 2022 Share Posted September 23, 2022 3 hours ago, Sergiorex said: Oh… is there a way to differentiate between theropods and herbivores? I'm sure it varies among locations, but typically theropod material is much denser, harder, smoother (at least on the outside). Herbivore bone typically has a thinner cortical layer on the bone, an is often highly fractured and delicate. Many theropod bones are also hollow, or have large "honeycomb" lattice in the core. Herbivores have marrow that looks like a dense sponge. I know its no a hard and fast method, but you tend to learn how each looks after handling a lot. Also, in note to the tag, dinosaurs dont have a "mandible". They have the maxillary (upper) and the dentary (lower). 1 "There is no shortage of fossils. There is only a shortage of paleontologists to study them." - Larry Martin Link to comment Share on other sites More sharing options...
piranha Posted September 23, 2022 Share Posted September 23, 2022 17 hours ago, hadrosauridae said: Also, in note to the tag, dinosaurs dont have a "mandible". They have the maxillary (upper) and the dentary (lower). https://anatomypubs.onlinelibrary.wiley.com/doi/epdf/10.1002/ar.24602 1 Link to comment Share on other sites More sharing options...
Troodon Posted September 24, 2022 Share Posted September 24, 2022 23 hours ago, hadrosauridae said: Also, in note to the tag, dinosaurs dont have a "mandible". They have the maxillary (upper) and the dentary (lower). Ive seen quite a number of papers that paleontologists refer to the lower jaw has mandible. 1 Link to comment Share on other sites More sharing options...
Sergiorex Posted September 25, 2022 Author Share Posted September 25, 2022 So the “skull Piece” is unlikely to be theropod? I can probably get more pictures if it helps. Link to comment Share on other sites More sharing options...
DinoFossilsUK Posted September 25, 2022 Share Posted September 25, 2022 2 hours ago, Sergiorex said: So the “skull Piece” is unlikely to be theropod? I can probably get more pictures if it helps. More pictures won't really help, I would ask the seller why they think the bone belongs to a T. rex. Like Troodon said, the only possible reasoning for this would be that it was found along with other identifiable Tyrannosaurus fossils. I doubt that's the case though as it doesn't look like a theropod bone. Link to comment Share on other sites More sharing options...
Sergiorex Posted September 26, 2022 Author Share Posted September 26, 2022 They said that they bought it from someone else and everything else they bought matched the description. They said they can refund me if it isn’t as described. Link to comment Share on other sites More sharing options...
Mahnmut Posted September 27, 2022 Share Posted September 27, 2022 Hi, it seems that your seller trusts his source, which does not exclude the source being wrong sometimes. Of course there is often a bias towards calling things T-rex, because, well, trade. Concerning anatomy (just my opinion, me being no native speaker), the dentary is just one toothbearing part of the mandible, while mandible is a term used very broadly, even to describe moving mouthparts of arthropods. Best Regards, J Try to learn something about everything and everything about something Thomas Henry Huxley Link to comment Share on other sites More sharing options...
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