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  1. 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 Fee
  2. FF7_Yuffie

    Lance Formation Tyrannosaur Tooth

    Hello everyone, A Tyrannosaur tooth here, it measures 1.1 inches, and is from Wyoming (Weston County) Lance Formation. If anyone can ID it as Nano or T-Rex, that would be much appreciated. There some very slight serrations, which I have zoomed in on. Thanks for the help.
  3. rocket

    Auction of "Chen" cancelled

    this is shocking... Christie’s Pulls T. Rex From Auction, Citing Need for ‘Further Study’ - The New York Times (nytimes.com) but, for my opinion its the right decision and Black Hills is absolutely right. I am a bit frustrated that the selled did not give the right infos about the T-Rex, no teeth are original, that it is a "cast" of Stan and no one really knows how many bones are original.... When a fossil like this will be offered for sale honesty is absolutely necessary! Hope the seller will be banned from Auction-Houses
  4. jikohr

    Is this T-Rex Tooth restored?

    Hi everyone! I recently acquired a very large (3.5+ inches) digested Rex from McCone County, Montana. The seller said no repair or restoration and I just wanted to make sure. I shined a UV light on it and there is one area that I'm interested in. Along the mesial Carinae is a very dull green under the UV. I tried to capture it with my phone but all I got was blue light since my Camera isn't equipped for that. Typically when I see restoration it's a very bright and vibrant green under UV so I'm not sure if this dull green area is restoration, if it's just an area that was stabilized, or if
  5. https://www.nationalgeographic.com/science/article/call-to-split-tyrannosaurus-rex-into-3-species-sparks-fierce-debate https://www.nytimes.com/2022/02/28/science/tyrannosaurus-rex-three-species.html?smid=tw-share Gregory S Paul new paper has just dropped with an interesting hypothesis to say the least. I for one think it is worth considereing.
  6. Thefossilman92

    Very tiny tyrannosaurid tooth

    I have this very tiny tyrannosaurid tooth from hell creek formation, south dakota. Im wondering if it's possible to know if the tooth is from a infant nano or t-rex? Distal serration density: about 6/mm Can't see any intact serrations on the mesial side. Crown Height: 4 mm Crown base-lenght: 2,5 mm Crown base-width: under 1 millimeter, about 0,8 mm to roughly estimate (very hard to measure this one).
  7. Hi everyone! I’ve been thinking of purchasing this T-Rex tooth. As you know they do not come cheap nowadays so I would really appreciate any input. According to the seller it was found in Hell Creek formation, South Dakota and has no cosmetic restoration whatsoever. It’s in it’s found “crushed state”. Approx 3 inches long and 1 3/8 inches wide. Do you see any red flags with it? Thanks!
  8. digit

    T-rex toes

    Here's a (hopefully) interesting question on a topic well outside my wheelhouse. In the break room at the Florida Museum of Natural History sitting on top of the double refrigerators is a cast of a coelacanth, a painted resin cast of a Tyrannosaurus rex foot (the left one), and inexplicably a cleaning sponge that one of the artists at the museum has modeled into a cartoon character named Robert with quadrilateral trousers. I've been looking at these objects while nuking my lunch in the microwave oven next to the refrigerators for several months now. Just yesterday I finally notice
  9. 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.
  10. 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).
  11. Sales just concluded a min ago. I definitely wasn't expecting it to reach this insanely high amount. No word yet AFAIK on whether he's going to a private collection or museum Is this the highest a dinosaur has ever been sold for? I wonder what precedence it'd set for fossils and paleontology moving forward On the pro side, it'd encourage more folks to go out there looking for fossils and possibly finding rare and important finds. On the con, more fossils might be priced out of the reach of museums
  12. Hello! I inherited this piece with the idea that it could possibly be a space rock. I checked the magnetism and it has no magnetic properties whatsoever. After closer examination with an open mind and a little imagination, I see a petrified baby dinosaur laid on its side with its neck possibly broken at the base of the skull. Below what looks like the neck is a split section that looks like a chest cavity with a arm/leg on either side. . The strangest part is that there seems to be the head of another species resting on the side of the laid do
  13. Hi all. I'd like to begin by thanking the members of this forum for the profound wealth of knowledge that you all have shared with me during my search for further understanding of dinosaurs, fossil collecting, and fossils in general. Prior to joining, I was a longtime lurker that regularly referenced this forum and its many posts to answer countless questions that I had, and I continue to reference it! The information contained on this site is invaluable. I would especially like to thank @Troodon for his amazing guides and detailed write-ups, such as the case made for Nanotyrannus. That really
  14. FF7_Yuffie

    Dinosaur scapula

    Hello, Any thoughts on this? Adding a Rex bone would be awesome, if I can get it confirmed as been legit. Hell Creek, South Dakota, said to be possible end of a scapula 7 x 4 3/4 x 1 Now, weirdly, when I try to contact the seller I get an error message. So I can't get a more exact county/town yet---but hopefully that error will be fixed so I can soon. So, is the ID on this good? Also, the bit near the top where the ID number is added--the color looks off. Is that restoration? Thanks for the help
  15. Mousehead

    T-rex tooth or another dino?

    Only other info I know is it's supposedly from Liberty County, Judith River Formation. About 2" long. Doesn't look like a carch tooth so I'm hoping it's actually T-rex.
  16. jikohr

    Nanotyrannus or T-rex?

    Hi everyone! So, yeah. I keep going back and forth on this one. I've been told it's Nano, but the serration count seems low for Nano (23 per cm distal 25 per cm mesial) and it looks a lot thinner than it actually is on account of a piece of the base missing. That and it's really big for a Nano tooth. Dimensions in mm are 50 x 18 x 11 Dimensions in inches are 1.97 x .71 x .43 The pictures are labeled rex because that's what I though it was originally. This is just bugging me so I'd like a second (or more opinion) just to put my mind at ease once and for all.
  17. Hello everyone! I just started learning about dinosaurs and am very excited! I’m trying to grapple with some weird things about the T-rex and was wondering this: could T-rex have been a “persistence” or endurance hunter? I’ve been reading things that say the T-rex was probably slower than most of its prey. Rather than out-sprinting its prey, might T-rex have simply been in “better shape”? That is, might it have been capable of sustaining an elevated pace far longer than its prey, then relying on superior tracking skills to relentlessly close on hiding prey attempting to co
  18. A new "T-Rex" tooth just showed up on our favorite site. It is not a Tyrannosaurus rex tooth however but a more common and far cheaper Carch tooth. We know this because of its more blade-like morphology, its slender profile, its shape, its smaller denticles and the sand on the base I already notice multiple bids on it and I have no doubt the price would escalate as many hopeful collectors would try their hands on getting a cheap T-Rex tooth for themselves. For anyone looking to buy a true T. rex tooth, there are several factors to take note of: 1) Thi
  19. Hi there! I recently purchased this online, could you please help identify this? the seller was unsure if it was a juvenile trex or a nano. It was found in Hell creek dawson County east of Glendive Montana Thank you :)
  20. Hello i am considering purchasing this T-rex tooth. The seller claims that their are no repairs with nice enamel and good serrations. with the only damage on the tooth mentioned being on the inside edge. My questions are simple is this really a tyrannosaurus rex tooth and is there any sign or repaired damage or anything that would indicate the tooth is fake etc. Information about the tooth: Age: 65 Million Years / Carter County, Montana Hell Creek Formation / Size: 2 inches long Below are the images they have provided.
  21. Hi everyone, do you all think this would look better with the cracks filled and fully restored or as is?
  22. Hello. A while ago I purchased this specimen from a highly reputable and established seller. It's a T-Rex jaw fragment from Lance Creek, Wyoming, and was a surface find (see photos of the original specimen in situ; according to the finder, "the piece in question is at the very bottom left, on top of the edge of the longer bigger bone; the tooth grooves are face-down."). I'm reaching out to Fossil Forum for guidance along the following lines: 1) What part of the jaw is this most likely from? I've been studying images on-line at a cursory level, but I can't find
  23. Hi all, I could not resist and purchased this tooth knowing it would be a tough call to make. It was found in the Hell Creek Fm. The big problem is the worn down mesial carina, there are however some remnant denticles I could measure, but not midline – more posterior. Taking them into consideration the tooth has distal 4.5 denticles per mm and mesial 6 per mm. The other measurements are: CH 1.47 cm / CBL 0.74 cm / CBW 0.39 cm. Based on this and the oval base I am leaning towards Dakotaraptor but might as well be a specific T-Rex tooth position.? I really need someone more experienced to take a
  24. I found a mark of suspected skin in the deepest part of the large footprint of a suspected dinosaur? I found very little data on the toe skin marks on the Internet. Some people know what the skin texture is on the toes of large theropod dinosaurs?
  25. Hello All, So recently I've been doing a little bit of reading on random fossil news to pass the time, and I keep reading a lot of comments about "illegal fossils" and whatnot. One specific specimen that comes up a loooot in my readings is the T-Rex fossils. Some mention the legality of the issue, some mention the fact that they might be going to private collectors rather than museums, and many mention both. I understand why the scientific community might want to perform research on the specimen, but seeing as there are more than a single T-Rex fossil that belong to museums, shouldn't thi
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