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Found 20 results

  1. Today is my last day off before I go back to work and I was supposed to spend the day making fossil starter kits. I have a cold though and I do not want the kids to think that 12 million year old shark teeth gave them a cold lol I am pretty bored so I thought I would post about our Judith River dinosaur fossils and how we are going to get discuss this formation. I am really surprised how much I am enjoying learning about these dinosaurs and this will be a formation that we spend a good bit of time on. It must have had some very productive ecosystems and there is a great diversity here to discuss. The kids will also get to see some familiar dinosaur families while learning about species that are new to them. I think during adaptation related presentations, this formation lets us get into ecological niches and discuss how two Tyrannosaurids existed as did at least two species of Dromaeosaurids and a Troodonitd plus other predators including non dinos. That is a lot of hungry mouths so niche selection and adaptations become very important. THere is also a great diversity of herbivores in this formation. I love the Ceratopsians from this formation and the diversity gives my son a lot of artistic options. We currently have one tooth but by the time we present we will have a couple more I think. This allows us to present a few species and say the teeth are not diagnostic so the teeth could have belonged to one or more really cool looking horned dinosaurs. This also gives the kids knowledge that there other Ceratopsians besides Triceratops. This will also be the point where we introduce Dromaeosaurids. Raptors are just iconic and this formation gives us the chance to really hit on adaptations. We have a Saurornitholestes tooth and will soon have a Dormaeosaurid caudal vertebra. While not assigned specifically to Dromaeosaurus, the vert will presented that way so we can talk about the differences between the two raptors. Of particular interest is the larger skull, more robust teeth, and specific wear patterns on the teeth of Dromaeosaurus. We will also have a small tooth tip from a Tyrannosaur indet. The kids will love learning about other Tyrannosaurids and I will leave it to the kids to imagine which one it belonged to. The real owner of the tooth is not important. That two existed in this formation is what is important. They must have occupied different niches plus a lot of kids may think T-Rex was the only member of that family. The last fossil I know we will have from Judith River is one of my favorites. It is an Ankylosaurus tooth and thanks to some help from TFF members, I spotted this among a few Nodosaur teeth. In our inventory, this is Ankylosaurus indet. However, in every single dinosaur presentation we do this will be Zuul and it will be a rock star. We want the kids to understand that there are many new discoveries being made and there will be a lot of new dinosaur discoveries made by THEIR generation. Everything about Zuul will be cool to kids. It is the one of the most incredible fossils ever found, armored dinosaurs are just cool, and it even has a pop culture name that a lot of kids will recognize from Ghostbusters lol Only 5 fossils but we can do A LOT of quality education with these fossils. I also have a very clear idea of the next items to find from Judith River. #1 on that list is a Dromaeosaurus tooth. A tooth gives us the perfect way of illustrating the difference between the raptors. We have two more purchases to complete before I buy again so I will save up and in the spring I start searching for that tooth. I also would love to add a hadrosaur bone from this formation and eventually I will track down a frill piece. Anyway, here a couple of the fossils... Pic 1- our Saurornitholestes tooth. Not a great picture but a really nice tooth. Pic 2- the Dormaeosaurid indet vert. Not here yet but will be right around my B-day. Pic 3- the Anky tooth. It is just a cool tooth and Zuul is a great dinosaur to teach kids about so Zuul is what this tooth is for Fossils on Wheels. Our only fossil from an armored dinosaur.
  2. Nanotyrannus?

    I've been looking at this tooth labeled Nanotyrannus from the Lance Formation in Wyoming (scale is in cm) . Now, the photos aren't great but I'm sort of wondering if it really is Nanotyrannus. It isn't quite as rectangular as other nano teeth I've seen (though I'll readily admit that I haven't seen a lot) and seems less curved. Any thoughts?
  3. Tyrannosaurid Tooth ID

    Howdy, folks! So just thought I'd pop a thread up for a partial tooth in my collection. It was originally sold as "unknown - possible croc tooth" when I purchased it. I tried getting an ID on it a couple of years ago, but the lighting in the photos made serrations hard to see, and it was tough to distinguish small details.... So here's attempt #2 (with better pics)! Any confirmation of ID mucho appreciated. Locality: Hell Creek, USA (afraid exact location is unknown) Mesial view?: Distal view?: Cross section: Closer look at denticles:
  4. Tyrannosaurid indet.

    From the album My Collection

    Tyrannosaurid indet. (Likely Daspletosaurus horneri or Gorgosaurus sp.) Two Medicine Formation Browning, Montana
  5. My June expedition was super fun and interesting to see what I could find. I have lots of unknowns and lots of fossil material that others will be able to help id. Thanks in advance for all those that join the discussion and help me figure out my library of dinosaur fossils.
  6. Hello everyone. I saw this nice Albertosaurus tooth fragment online being sold for relatively cheap. I thought it had nice size,serrations and tip. It is from the Judith formation in Montana. Do you think it is worth considering? Or do you think I should keep my money. If I could get it a bit repaired and nicely reglue the fragments,It could be quite neat I think. It would be my first Tyrannosaurid in my collection (and my only for a long time). What do you think? Here are the 3 pictures I have. Thanks alot,Regards
  7. Tyrannosaurid Tooth?

    Hi folks! Thought I might try leaning on the expertise of the forum gurus - I've owned this tooth for a few years and would like to hear any opinions of what the specimen should be classed as. It was sold as Daspletosaurus Torosus, but I'm aware of how hard it can be to label Tyrannosaur teeth (or just leave them as 'indet'). The tooth originated from Alberta, Canada. As it isn't the clearest to see, the denticles (which are very fine and equal in size on both sides) on the anterior edge curve off to the right (viewing the tooth face on), whilst the posterior serrated line is straight. PS: Apologies for the quality of photos too...my phone doesn't enjoy photographing anything magnified.
  8. Wear facets, spalling and split carinae are typical features you see on Tyrannosaurid teeth that add character and mystery to these teeth. Here are two papers that examine these features. Wear Facets Lambe (1917) noted wear surfaces on the side faces of tyrannosaurid lateral teeth from the Red Deer River deposits of western Canada. He wrote “as the upper teeth closed outside those of the mandible any wear, not on the point, would result from the contact of the inner surface of the upper teeth with the outer surface of the lower ones.” Recent work, has, however, challenged this assertion, suggesting that the shapes, locations, and incidences of tyrannosaurid wear surfaces are not indicative of tooth−tooth contact (Farlow and Brinkman 1994; Molnar 1998; Jacobsen 1996, 2003). Here the paper reevaluates this evidence by examining wearstriations in tyrannosaurid lateral teeth in addition to the shapes and locations of their wear surfaces. Wear facets and enamel spalling in tyrannosaurid dinosaurs Blaine W. Schubert and Peter S. Ungar Acta Palaeontologica Polonica 50 (1), 2005: 93-99 app50-093.pdf Split Carina 11% of the teeth studied in the paper exhibited this trait. Trauma, aberrant tooth replacement, or genetic factors may have led to the development of split carinae. The paper concluded that although not conclusive genetic factors get the most support but additional study is needed. Other factors like nutrition may play a part but the paper points out is not testable. Pay walled Split Carinae on Tyrannosaurid Teeth and Implications of Their Development Gregory M. Erickson Pages 268-274 | Received 14 Jun 1993, Accepted 17 Jan 1994, Published online: 24 Aug 2 https://doi.org/10.1080/02724634.1995.10011229 From my collection
  9. 3.75" tyrannosaurid tooth. Indet.?

    Fossil tyrannosaurid tooth found last weekend. 2nd largest one I have found and largest in the area by at least an inch. Formation is belly river group. I believe i is out of dinosaur park formation layers and possibly mix of oldman and foremost formations. I'm thinking gorgosaurus or daspletosaurus???
  10. Tyrannosaurid Bone from Delaware

    A new unrecognized metartarsal from a tyrannosaurid in Delaware is discussed in this paper. It increases the diversity of tyrannosaurids in Appalachia which previously included, Appalachiosaurus montgomeriensis and Dryptosaurus aquilunguis. Fitting for our first state. Brownstein CD. (2017) A tyrannosauroid metatarsus from the Merchantville formation of Delaware increases the diversity of non-tyrannosaurid tyrannosauroids on Appalachia. PeerJ 5:e4123 https://doi.org/10.7717/peerj.4123
  11. Texas Teeth

    Here's some of my best Texas teeth. All personal finds except for the partial Tyrannosaurid tooth. The little red tooth on the bottom is also Mosasaur.
  12. Chiropractor discovers BC's first dino skull. Looks like a Tyrannosaurid. Pretty good find while on holiday http://www.cbc.ca/amp/1.4158748
  13. Interesting paper that supports reptilian looking tyrannosaurids From Abstract Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including Tyrannosaurus rex, were extensively feathered. We describe fossil integument from Tyrannosaurus and other tyrannosaurids (Albertosaurus, Daspletosaurus, Gorgosaurus and Tarbosaurus), confirming that these large-bodied forms possessed scaly, reptilian-like skin. Body size evolution in tyrannosauroids reveals two independent occurrences of gigantism; specifically, the large sizes in Yutyrannus and tyrannosaurids were independently derived. These new findings demonstrate that extensive feather coverings observed in some early tyrannosauroids were lost by the Albian, basal to Tyrannosauridae. This loss is unrelated to palaeoclimate but possibly tied to the evolution of gigantism, although other mechanisms exist. http://rsbl.royalsocietypublishing.org/content/13/6/20170092
  14. Tyrannosaurus sp?

    Tyrannosaurus sp? from West Texas. No restoration or repair. 1 1/2".
  15. I searched the web and found only a reference to another thread that seem to say this was Tyrannosaurid indet but it seems to be some time back before Timurlenga was described as a species. My question is, is it possible this is timurlenga? Or does the Bissetky Tyraanosaurid sound a better fit?
  16. I bought this nice theropod tooth online and the seller told me that it was a Daspletosaurus from the Judith River Formation, Montana. While looking online for more info, I found a few people saying that some dealers lie about the genus of tyrannosaurid teeth (especially with Daspletosaurus) as they are hard to identify. Just wondering if anyone here can I.D. this tooth? Suggestions are much appreciated!
  17. Tyrannosaurid tooth

    Tooth of a Tyrannosaurid. This tooth belongs to either Albertosaurus, Gorgosaurus or Daspletosaurus. Note the wear facets on the top and medial side of the tooth.
  18. Its is found at the ili river basin, dzhungar alatau kazakhstan,
  19. Collectors, sellers on online and some dealers periodically ask me to help them in the identification of tyrannosaur type teeth. So I thought I would put something together to share my understanding of these teeth. I am focusing on teeth from the formations that are collected most frequently and available for sale. These include Hell Creek, Lance, Judith River, Two Medicine and the Canadian Formations of the western Provinces. Starting with the Campanian (72-83 mya) deposits there are three types of Tyrannosaurids present: Gorgosaurus, Albertosaurus, and Daspletosaurus being the largest. Teeth of these dinosaurs can exceed 4" (10cm) but most being sold or found are less than 3". Paleontologists views on identification of these teeth has changed over the years and is still evolving. A paper that came out in 2005 which was authored by Phil Currie et al. studied teeth from this period looking at tooth and serration morphology. Their conclusion was that "it is difficult to quantifiably distinguish these teeth reliably by taxon" . Bottom line, in my opinion, all these type of teeth should currently be identified as Tyrannosaurid indet. until further notice Having said that if you happen to be the proud owner of tooth around 4" its fair to say its probably from a Daspletosaurus. I'm not aware of any Gorgo or Alberto skull with teeth that large but have not seen them all. In the Maastrichtian (66-72 mya) deposits there are two Tyrannosaurid present: T-rex and the controversial Nanotyrannus Serrations need to be approximately the same size on both anterior and posterior sides Everyone is focused on the belief that T-rex serrations need to be under 2/mm for it to be a Rex. The facts do not support that belief. First the Campanian Tyranno study showed that tooth serrations do not aid in distinguishing between taxon and that study included juvenile T-rex teeth. Second, since I did not have a similar Maastrichtian research paper to fall back on I did an unscientific study with teeth from my collection. I sampled a dozen maxillary and dentary teeth from both Nano's and Rex's. Nano teeth ranged in size from 7/16" to 2" and Rex teeth were 1/4" to 4 1/2". I used both juvenile and adult teeth. (all counts were done over a 5mm spread on the distal side mid tooth) My findings were interesting and surprised me. In both species the number of serrations decreased in quantity as the tooth became larger. The serration count results: Nano's : Range from 4.5/mm to 2.7/mm Size: 7/16 to 1" : 4.5 to 3.4/mm 1" to 2" : 3.1 to 2.7/mm Rex's: Range 4.3/mm to 1.6/mm. Size: 1/4 to 1" : 4.3 to 3/mm 1" to 2" : 3.4 to 2.5/mm 2.5 to 3.5" : 2 to 1.8/mm 4.5" : 1.6/mm So how do you tell the difference between Nano and Rex. Well if its 2 1/2" or larger and has bulk its clearly Rex regardless of what the serrations say. It cannot be anything else. The problem arises with smaller teeth, you cannot go by serration count since they are similar. Clearly some small maxillary teeth will mimic each other and those have to be identified as Tyrannosaurid indet. However there are clear morphological difference in smaller teeth. The best way to distinguish these teeth is first in the cross section at the base and second compression Rex dentary teeth are oval at the base and you can see that in most maxillary teeth. Nano teeth are unique as tyrannosaurids go they are compressed and their cross section at the base is rectangular. A good technical way to see Rex teeth is that they are fat. Here are examples of the cross sections of couple small Rex teeth under 1 1/2 inch and Adult Nano's Shape at the base Tyrannosaurus rex Dentary teeth are oval Maxillary Teeth are rectangular Example of the shape of these teeth at the base. Although these are tyrannosaurids from the Judith it's applicable to T-rex Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification Article (PDF Available) in Acta Palaeontologica Polonica 50(4):757–776 · April 2005 with 762 Reads Nanotyrannus Teeth are rectangular (Pinched in center) Compression Tyrannosaurus rex Crowns are fat, rounded tips Nanotyrannus Crowns are compressed, more flattened, tip tends to be pointed . So if you are comfortable distinguishing between the two you can own a Rex tooth at a price that is much more affordable than the big one. It will not be the statement piece but its still Rex. Aublysodon Premaxillary teeth, those without serrations. This dinosaur is considered nomen dubium and teeth ascribed to it belong to other Tyrannosaurs. Pre-Maxillary Teeth Small Pre-Maxillary teeth are indistinguishable between species. These should all be identified as Tyrannosaurid indet.. If you have one where the length is greater than 1 1/2" it Trex and enjoy however larger ones can easily be confused with Dentary 1 position. The figure below shows you the difference between PM1 and D1. The lingual face on PM1 is flat forward of the serrations, not the case in D1. These of course are my opinions and I understand that there is a different views by some on Nanotyrannus and that's okay. We will convert you someday
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