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Found 59 results

  1. Tyrannosaurus rex serrations collage

    From the album Dinosaurs

    To me, serrations are such a fascinating tool. They were independently evolved many times in many different animals. They concentrate force into smaller points (increasing the pressure = Force/Area) so that the thing being bitten would break or cut along the line of serrations. They also are great for "sawing" through things such as muscle. T. rex definitely made great use of this adaptation. Topmost (greyscale) image from "Physical evidence of predatory behavior in Tyrannosaurus rex:" https://www.researchgate.net/publication/249649164_Physical_evidence_of_predatory_behavior_in_Tyrannosaurus_rex Most of the pictures (color) in this collage are from two associated fragments of what I am certain was a T. rex tooth from the Hell Creek Fm., SD based on the size and shape of the serrations. The images with the scale markings have been scaled to match each other. More on theropod serrations: "Developmental and evolutionary novelty in the serrated teeth of theropod dinosaurs:" https://www.nature.com/articles/srep12338
  2. Stan T. rex tooth replica (2)

    From the album Dinosaurs

    Closeup shot of the distal serrations.
  3. Stan T. rex tooth replica (1)

    From the album Dinosaurs

    A high-quality replica of Stan's 2nd maxillary tooth. About 11.5" in length. Displayed with a 3D-printed stand I designed.
  4. T. rex tooth chunk

    From the album Dinosaurs

    A small piece of (probably) rex tooth from the Lance Creek Fm., WY. Shown next to a replica for comparison.
  5. Hello, I was doing a study on the T. rex and Nanotyrannus teeth specimens I had, and I wanted to compare them against a list of known T. rex teeth with measurement. The paper: Dental Morphology and Variation in Theropod Dinosaurs: Implications for the Taxonomic Identification of Isolated Teeth (JOSHUA B. SMITH, DAVID R. VANN, AND PETER DODSON) contains a list of 115 T. rex teeth. To make it easier to compare and read the data, I combined the measurements into a single chart, added colors and lines for ease of reading, and added the size and names of the T. rex used in the study Feel free to refer to the below chart for T. rex teeth measurements. I had to split the chart into 2 due to size limitations, but if you want the full-sized PDF version (25 MB), please message me so I can send it to you by email. If you have any suggestions to improve readability, or have your own data to add, go ahead and post it here! I will be posting pics and measurements of my various T. rex and Nanotyrannus teeth here @Troodon
  6. I read somewhere in a paper by Jack Horner, that G-Rex was said to be around 16 years old when it died using bone histology. In the same paper it said that it was shown by LAG intervals that G-Rex would've continued to grow for 2-3 more years had it not died. This means that the infamous G-Rex was a sub-adult. Jack Horner's Paper: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.515.6451&rep=rep1&type=pdf This got me curious on how big exactly was G-Rex? What was its height, length, and weight? I tried googling the answers for these but to not avail as people seldom mention G-Rex all that often and there are no skeletal models or mounted skeletons. Can someone tell me why this is? And what is the true size of G-Rex.
  7. How strong could a t-rex's bite force be? What modern day animals could it compare it's bite force to?
  8. Wow its already the 17 of January where has the year gone? Well always time for some cool photos of some great fossils to keep us going Its not unheard of to find dinosaur bite marks on a fossil. This Triceratops pelvis on display at Museum of the Rockies has Tyrannosaurus bite marks on it (red arrows) One way to identify a theropod bone is to see if they are hollow, another way is to look at their vertebra most are pneumatized, have a honeycomb structure. Here is an example of a T rex vertebra You hear alot about the Nanotyrannus associated with the Dueling Dinosaurs but here is a photo of the foot of other partner in this dynamic due a Triceratops. Complete ceratopsian feet are rare and this is the ventral view of one. in the less prepped version Mike Tribold posted this photo of Axestemys infernalis, a new soft shelled turtle from the Hell Creek Formation. I am sure Mike will have it on display at his booth at the Tucson 22nd Street Show More info on this turtle can be found here https://palaeo-electronica.org/content/2019/2827-a-new-species-of-trionychid The lower jaw of the pterosaur Liaodactylus, with its numerous and extremely slender teeth. At 160 million years old, this is the earliest evidence of adaptations for filter-feeding in pterosaurs. Info by Jordan Bestwick Check out these loooong flight feathers on the wings of Confuciusornis sanctus. Courtesy of Talia Lowi-Marri Palaeontological Institute in Moscow gives us the rather mean-looking Archosaurus rossicus, from the very end of the Permian (~255 Mya) in Russia. Skull is a bit under half a meter long. Not something you want to meet hiking in Siberia. The Supraorbital horn of Baby and Juvenile Triceratops (or Torosaurus), courtesy of the BHI Carnotaurus sastrei, original holotype skull. photo by Damian Perez Tom Holtz shared a different view of the Tyrant King skull From the Smithsonian's NMNH Deep Time exhibit, a beautiful Gorgosaurus libratus skull Here is a photo that compares different Tyrannosaurid finger bones digit I-1. From left to right : Gorgosaurus TVM 2001.89.1, Nanotyrannus BHI-6437, adult T.rex MOR-980, and sub adult T.rex TCM 2001.90.1. Your can see on similarities with the two on the right both of Trex of different ages. Interesting thought the paleontologists said the younger one should be longer photo P. Larsen
  9. Mechanisms of soft tissue and protein preservation in Tyrannosaurus rex Elizabeth M. Boatman, Mark B. Goodwin, Hoi-Ying N. Holman, Sirine Fakra,Wenxia Zheng, Ronald Gronsk & Mary H. Schweitzer NATURE Scientific Reports | (2019) 9:15678 | https://doi.org/10.1038/s41598-019-51680-1 natu about 9 MB
  10. Tyrannosaurus rex or nanotyrannus

    Hey everyone....im gonna start posting everything i have over the next few weeks to get everyones opinions.....if i need to post more info about a specimen just let me know.....first up is a tooth tip i got ...it was labled t- rex or nanotyrannus......from hell creek.
  11. Is nanotyrannus valid?

    Hello everyone, I know this is a big scientific debate and I have researched about it but I haven't come to a conclusion. What do you think? Thank you
  12. T rex or nanotyrannus teeth

    Hello everyone, after having seen many pictures of "nanotyrannus" and t rex teeth i have some questions. The first one being, how can paleontologists distinguish nano teeth from rex teeth and also sell them for a different price when the current theory is that they are the same dinosaur, also in many cases I have seen nano teeth with the same size as t rex teeth differentiated, so if they are the same dinosaur how can this be possible? Thank you for your time.
  13. On Saturday Oct 5, Tyrannosaurus rex celebrated its 114 birthday when it was formally named by H F Osborne in his 1905 paper: Osborn, H. F. (1905). "Tyrannosaurus and other Cretaceous carnivorous dinosaurs". Bulletin of the AMNH. 21 (14): 259–265. hdl:2246/1464. Retrieved October 6, 2008. One little known fact was that Albertosaurus sarcophagus was also formally named on the last page of that paper based on this skull.
  14. I've just received this weird little tooth from the Hell Creek Formation. It was sold to me as a Dromaeosaur premax tooth but I have my doubts as it's quite robust. That said, the other candidate would be a Tyrannosaur and I've never seen a premax tooth with a twist like this. What's more, the carinae are strange - one has nice crisp serrations (I thought they looked a lot like Tyrannosaur serrations) while the other is smooth (it doesn't look like it ever had any serrations). Anyone have any idea what it might be?
  15. My Collection

    New to collecting and this site, thought I’d debut my small collection in my first post. Any comments or tips would be appreciated.
  16. Hello All, I'm new to fossil collecting as well as this forum. I'm looking to pick up a T Rex tooth and came across the one in the attached images. I'm just wondering if you could help me verify that it is genuine? It comes from the Hell Creek formation so I believe it is, I just wanted to be sure. Also, if anyone has any reputable sources for T Rex teeth, that would be great to know as well (PM). Thanks in advance!! -Derek
  17. Step aside Sue, the T rex. The attached article finally describes the largest T rex discovered from the Frenchmans Formation of Saskatchewan, Canada after being discovered in 1991 Abstract Here we describe an extremely large and relatively complete (roughly 65%) skeleton of Tyrannosaurus rex (RSM P2523.8). Multiple measurements (including those of the skull, hip, and limbs) show that RSM P2523.8 was a robust individual with an estimated body mass exceeding all other known T. rex specimens and representatives of all other gigantic terrestrial theropods (Paywalled) https://onlinelibrary.wiley.com/doi/10.1002/ar.24118#.XJQsTuqqy7k.twitter An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex W. Scott Persons IV, Philip J. Currie, Gregory M. Erickson First published: 21 March 2019, https://doi.org/10.1002/ar.24118
  18. I have been working hard lately on all of our programs and we are very close to having the dinosaur presentation I want us to have. We have a name for this program, Dinos Rock. Yes it is not super creative but for 2nd graders, this is a geology themed program. For 3rd graders, it is adaptation based but the name works. We have added some pieces that gives us more than a few teeth. Nothing museum quality or anything but a few bones help the visual factor. I have been studying the biology, geology and ecology of dinosaurs so the science will be good. my son is working on the art but we wont have any done soon, he has school projects a head of this. We are close to being ready a full 6 months before I thought we would be. Hell Creek was going to be a focus for us because the fossils are available and this is the fauna that most kids will recognize. If you are willing to look hard, you can also find some real bargains from this formation. We turned a lot of early attention collecting attention to Hell Creek dinosaurs and I am actually really happy with where we are at with the fossil material we have. There is a lot of room to add and maybe upgrade in the future but this is a good start. This is the famous T-Rex and Triceratops fauna and we started our collection with those critters. Very early on, we were able to get a few Hell CreekTriceratops teeth. I am very happy that through a purchase from TFF member, we added two frill pieces. They are Lance formation but we are not covering the Lance formation yet so they will be used here. I also added a frill piece from Hell Creek. The kids will get to touch the largest frill piece which is a great bonus. An iconic dinosaur and I think well represented. Also early on, we stumbled into a great bit of a luck. A TFF member saw a post of ours and passed it on to another TFF member who sold us a beautiful Tyrannosaurus Rex partial tooth and gave us a really nice Nano too. It was very affordable and a generous gift was added that gave us nice pieces from the most famous dinosaur ever. The rock star really. I was not sure we would be able to get a decent example at all but to do it right off the bat was HUGE. This would not have happened if not for the members that decided to help us out. We are extremely grateful The first dinosaur fossil we got were two Hell Creek Edmontosaurus teeth that were a gift. We acquired a nice jaw fragment in a trade. I am a bargain shopper with a limited budget so I LOVE our Edmontosaurus as it has not cost much at all. I named this display Eddie I like it so much lol Hadrosaurs are important dinosaurs to talk about and I think a fair amount of kids may not know about them. I would like to add another bone later too. They seem attainable for us. Acheroraptor was behind only T-rex on the my list and we got a really beautiful tooth and it was another bargain pick up. I will talk a lot about this species and I will get deep into the biology/ecology of this awesome dino because I love Dromaeosaurids. Raptors are also an iconic dinosaur that kids love and this is a relatively new species which is another fun thing to discuss with the kids. We will also be introducing the kids to a theropod they have never heard of, Richardoestesia gilmorei. I have told me son to envision a toothed Cormorant type dinosaur as I lean toward them being a fish eater. It is pretty cool to get a Hell Creek dino that they will not know anything about. We have yet to add a Thescelosaurus fossil but we will before we start presenting. I want to add another piece of the fauna and it seems this is the most inexpensive option we will have. It will also give the kids another dinosaur they probably do not know and it will round out the basic Hell Creek fauna. There is no shortage of dinosaurs that we can add either. An Anky or Nodosaur scute is way up on the program list of fossils for me and hopefully we can find one from this formation. Dakotaraptor is #1 on my personal list and I will get one eventually. A Troodontid is also very high on the list as well. I know eventually i will also pick up an Ornithominid too. All three of these are more expensive so we will have to save and wait but each one would also make awesome educational dinosaurs. I also really want to add an Avian fossil. I have not researched this but my guess is they are very rare. Leptoceratops is another species I would love to add at some point too. They are really cute and kids will dig them. Anyway, here are some of the fossils. I think we have a good start going to our Hell Creek collection and I am looking forward to taking these to work with me very soon. Pic 1- Triceratops teeth and Eddie Pic 2- T-Rex, Nano, and Hell's Thief. I am so happy to have these fossils. Pic 3- One of the frill pieces. This one will end up in a larger Trike display with more teeth and another frill. Plus we will have nice frill for kids to check out too.
  19. Hey guys, Over 4 inches and was discovered in the famous Hell Creek formation
  20. Tyrannosaurus Rex tooth fragment (serrations)

    From the album Dinosaurs

    Closer view of serrations.
  21. Do you think this item has any repairs and is it a genuine t-rex tooth? I t is 2 5/8 in lenght.
  22. Tyrannosaurus Rex tooth

    From the album My Collection

    Hell Creek Formation, Faith, South Dakota, USA It is a beautiful tooth with no restoration. The tooth has the characteristic d shape profile of a trex tooth on the basal side and this sort of preservation is actually fairly common with tooth also collected from other locations such as Wyoming. The first ever dinosaur tooth that I owned!
  23. Hey everyone, I was just wondering what the size range (preferably in inches) is for a Tyrannosaurus Rex Tooth is. Thanks! - FossilsandScience
  24. Is this really T-Rex Premax tooth? Size is slightly less than 2 inches (T-Rex Premax tooth rarely exceed 2.5 inches). Can it be some other Dinosaur teeth such as Nanotyrannus? Thank you.
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