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  1. Hi All, I'm new to this forum and thought I'd send over images of my theropod teeth plus one extremely impressive sauropod from Madagascar. Hope you like them! Paul
  2. Hello everyone! Saw this nannotyrannus tooth for sale,is it really from nannotyrannus? Could it be something else? Any help would be apperciated IMG_8742.MOV dn02-2c.avif dn02-4c.avif dn02-3c.avif
  3. ThePhysicist

    Hell Creek collage

    From the album: Hell Creek Formation Microsite

    A representative sampling of the diversity captured in microsites - everything from Tyrannosaurus to mollusks.
  4. ThePhysicist

    Juvenile T. rex

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Garfield Co., MT, USA This is from the right maxilla of a juvenile individual (note the lingual wear). Art by RJ Palmer
  5. Toast123

    Is this a T. Rex tooth?

    1 inch tooth. Seller says it’s a T. Rex tooth, from what I’ve seen the T. rex teeth are more robust this one looks narrow but I’m not sure. From hell creek
  6. Toast123

    Baby T. Rex or Nanotyrannus?

    Location: Hell Creek formation, Carter county Very small tooth so it was pretty hard to get good and clear photos. I’ll try to add some better ones later today. I have two confirmed Nano teeth I used as a comparison, they both look more slender than this one, but I’m not sure.
  7. Hi I’ve been looking for a juvenile T Rex tooth and I came across this one, I was wondering if I can have some help to see if this is real? Thanks -Daniel
  8. ThePhysicist

    An ecosystem on my desk

    From the album: Hell Creek / Lance Formations

    Microfossils are the means by which we can most fully appreciate the diversity of a past ecosystem. From salamanders to Tyrannosaurus, an ancient river captured and preserved dozens of species that lived in Montana 66 million years ago, at the terminus of the time of dinosaurs. In this small collection alone, I count at least 27 species of dinosaur, lizard, crocodile, fish, shark, salamander, turtle, mammal, and mollusk.
  9. Gerald cisneros

    Fossil that looks like a tooth

    OK thank you guys for the info!! I traded a couple worker a mentoring for this thing! I polished it, and looks like a tooth to me
  10. Are Tyrannosaur fragments from hell creek really available for sale ? Any details on how they are labeled 'Tyrannosaur' would be helpful.
  11. Tidgy's Dad

    Diseased Dinosaurs

    https://www.bbc.com/future/article/20230214-could-dinosaurs-get-cancer
  12. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a very young animal. Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  13. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a juvenile animal (smaller than "Jane"). Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  14. Dino Dad 81

    T Rex battle-damaged and shorn tooth?

    Hey all, This is an unusual ID post. It's actually of the first tooth I ever posted on TFF. Back then I was primarily confirming that it was in fact T Rex and trying to get some understanding of what damage to the tooth was likely to be antemortem/perimortem/postmortem. The tooth is from the Hell Creek in Powder River co, MO and it's about 3". When it was sold to me, the seller felt he was seeing enough antemortem/perimortem trauma that he thought it was safe to say this tooth had seen its share of combat. The most interesting new bit of info someone offered me was that they've seen a number of teeth with the base-break trauma looking the way it does here and he believes they were shorn off during face-biting combat by a tooth of the opponent's. He was referring to the relatively clean slice-break that the tooth suffered rather than having the normal jagged break--and the presence of what appear to be serration-related chips/racking along the edge of the base-break (i.e., from an opponent's tooth). I've also learned a bit about T Rex face-biting since then, including the fact that it seems to occur when Rexes are in that sort of pre-adult growth spurt. This tooth seems to fit that category too, size-wise. I'm wondering if this looks like a battle-damaged and shorn off tooth to you. Thanks!!
  15. I was in the area, so I made a very brief stop by the HMNS. I'll state up-front that this will be extremely dino-centric. What I saw was really great, they have a chronologically-organized display of animals from stromatolites to humans (I only made it to the Cretaceous). The lighting is very dramatic, so seeing it in person is much better than the dark photos portray (I did edit a few of them to enhance visibility). Lots of dynamic posing which is nice compared to other museums. Also, most specimens aren't behind glass, and you can get really close. I believe most of the skeletons are casts (except for a couple of exceptional ones), but they're done well and don't disappoint. They currently have Victoria the T. rex as a traveling exhibit, although I think it has been recently moved and reduced in size to make room for the new traveling exhibit. She's one of the most complete individuals of T. rex and only slightly smaller than Sue (12' tall, 40' long, ~10.5 tons). Victoria was found in SD in 2013. She died sometime in her 20's (?), possibly from an infected bite on her lower jaw from another T. rex. Various elements: I think the feet aren't original. Coracoids, furcula, gastralia: Caudal vertebrae: Cervical vertebrae, some are fused: They had one of her femurs and her skull displayed separately:
  16. ThePhysicist

    Worn T. rex tooth (annotated)

    From the album: Hell Creek / Lance Formations

    Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access).
  17. ThePhysicist

    Worn T. rex tooth

    From the album: Hell Creek / Lance Formations

    Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access).
  18. The_bro87

    Nanno or Rex tooth?

    Hello! I saw this interesting tooth for sale and I’m on the fence about purchasing it. It’s a .66” Nanotyrannus tooth from Garfield county Montana. The tip is restored but that doesn’t bother me. I’m posting because the base seemed a lot thicker than a lot of nanno teeth I see, and I also couldn’t really tell if there was any of the typical “pinching” on the sides. I was hoping for help determining if this is a Nanotyrannus tooth, or possibly a T. rex. Thanks!
  19. Tidgy's Dad

    Why T rex had Short Arms

    Not really a lot of answers. From BBC News : https://www.bbc.com/news/science-environment-62088874
  20. Hello all, looking to get some opinions. 5-6 years ago I came across a ton of fragmented bones while scouting out a new collecting site. One of the first things that really caught my eye was this, lets call it a "claw". Like I said this was among a ton of shattered bone so it kind of stood out right away. I followed the bone fragments more up a very steep hill that turns into a cliff. This led me probably 50-75 feet from the initial sighting of bone to a place that was dangerously steep, but I could see more bone weathering out of the hill. It was in very bad shape and turned out to be a few vertebra. On my way up I also several pieces of what turned out to be a vertebral process. I collected what I could but a lot of it had turned to dust. I could tell there was more but there was almost no feasible way to safely dig. I began to look at what I was able to collect and I started seeing some interesting things. Some of the pieces of vertebra were very porous with large pores and I had found the "claw" at the base of the site. Could it be? Life got in the way, and I was not able to get back out until this year. To my surprise there is still bones weathering out. I found another vertebra in bad shape, and a shattered rib that I was able to reasonably piece together. This came out with minimal excavation and I saw there was more bone exposed at the same level around 6 feet away. It appeared to be another rib or flat bone, but it was in an even more difficult spot. Could these be Tyrannosaurus bones? I will include many more photos soon. Dawson county, MT.
  21. ThePhysicist

    Tyrannosaur dental ontogeny?

    From the album: Hell Creek / Lance Formations

    It's interesting to compare differently-sized teeth of similar positions. These might represent ontogeny or other dental variation (due to multiple species, etc.).
  22. ThePhysicist

    Tyrannosaur dental ontogeny?

    From the album: Hell Creek / Lance Formations

    It's interesting to compare differently-sized teeth of similar positions. These might represent ontogeny or other dental variation (due to multiple species, etc.).
  23. ThePhysicist

    Juvenile T. rex tooth

    From the album: Hell Creek / Lance Formations

    A young T. rex tooth. The preservation of the enamel is fantastic, and I like the dark hues. The serrations are also in great shape. There is some minor feeding wear on the tip.
  24. ThePhysicist

    T. rex tooth chunk

    From the album: Hell Creek / Lance Formations

    For most collectors, it's more affordable to have a piece of a T. rex tooth if you just want it represented. This one is clearly T. rex: it's theropod with serrations (this one has the basalmost portion of the mesial carina), very thick, and clearly would've had a large circumference. Note also the large angle made by the curvature of the tooth at the carina (not Nanotyrannus which have narrow, blade-like teeth).
  25. ThePhysicist

    Juvenile Tyrannosaur tooth

    From the album: Hell Creek / Lance Formations

    Sold by the BHI as Nanotyrannus lancensis. However, given the uncertain status of Nanotyrannus' validity, I chose to label it as Tyrannosaurid for now. It is interesting to compare to my other small Tyrannosaur teeth of the same/similar position. The base is clearly more compressed than my baby rex tooth (which is also smaller).
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