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Dinosaur skull fragment and limb fragments?


Sergiorex

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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.C68CC5D5-D0AC-4DEF-B679-087D28FB09B1.thumb.jpeg.8902aec9172aab287758a814449e8076.jpeg5D5F20FC-FAC6-4782-B974-1263601FA636.thumb.jpeg.042575db5a6f697c4e2e5f10f569bacd.jpeg5D5F20FC-FAC6-4782-B974-1263601FA636.thumb.jpeg.042575db5a6f697c4e2e5f10f569bacd.jpeg7DB797FB-518D-45EC-B094-37E91B89C45E.thumb.jpeg.d1ea4873b4b60ee70cc407e69dc3da96.jpeg843168F4-E85B-4A6F-9B43-9EA50640FAFA.thumb.jpeg.d6a2ea6a37c9d994aa02150868edc899.jpeg9780C8E2-9233-4CFE-8C39-F6FC2DB12D0E.thumb.jpeg.0a00ccfe6ca56430ef7e98a539027c22.jpeg527B2992-35F6-439E-89F7-217812B268C7.thumb.jpeg.e62ba0710fe751772f666dc88fc2a2a5.jpeg6F9382FA-BE56-4495-B044-C673D918AD25.thumb.jpeg.83af447d3a3db4ba65bd09b92721f549.jpegD75CB9CF-1EBE-4027-99DA-8A9280EEBD08.thumb.jpeg.ad443d8f2d077cd32e31d3a51cc68f11.jpeg35B4A2AE-FF1B-4186-9DE1-A825FDCDA2E4.thumb.jpeg.da71b172d7cfc6ef04e099fe6ca858e6.jpeg356596DD-E5AF-4FF9-AF68-DADA150783D7.thumb.jpeg.b1ce904731a5862d5ad8f7a68452bb3b.jpeg 

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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

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hadrosauridae
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).

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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.

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So the “skull Piece” is unlikely to be theropod? I can probably get more pictures if it helps. 

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DinoFossilsUK
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.

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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.

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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

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