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Showing results for tags 't rex tooth'.
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From the album: Hell Creek Formation Microsite
Not sure why, but I could look at serrations all day - little marvels of natural selection. And to imagine 66 million years ago these were cutting through dinosaur muscle fibers! -
From the album: Hell Creek Formation Microsite
Not sure why, but I could look at serrations all day - little marvels of natural selection. And to imagine 66 million years ago these were cutting through dinosaur muscle fibers! -
From the album: Hell Creek Formation Microsite
This tooth saw some action - a wear facet (caused by repeated opposing tooth-tooth contact), gouges in the enamel, and completely worn serrations (after the hard enamel wore away, continued use and softer dentine led to depressions where protruding denticles once were). -
From the album: Hell Creek Formation Microsite
A serrated fragment of a large T. rex tooth.-
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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- 1 comment
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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
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Hi all, I have the choice between these two T. rex teeth. One is shorter and fatter, 1.5” and the other longer around 2 - 3/8”. Former less cracked and better colouration. Latter longer but has some infill. The longer one base cross-section is a compressed oval since the base is the top of the root. The tooth body is not pinched. This and the larger size makes it a T rex tooth (according to the seller) and it is from Hell Creek, Powder River Co., Montana. There is also possible wear near the apex. The shorter one is perhaps “cleaner” with no infilling and is from Hell Creek, Isabel, So. Dakota. Shorter one “cleaner”, no infill but smaller. Longer one a little longer but has some crack infill. I gather that the length just might trump the presence of infill? Which would members recommend I go for? Thankyou
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Identification Though smaller than many imagine T. rex teeth to be, this is indisputably one. It is characteristically robust, and has chisel-shaped denticles with similar denticle densities on each carina.1 Those qualities support its identification as a Tyrannosaurid, and with the locality information confirming it originated from the Hell Creek formation, this must be T. rex. Comments Like most isolated theropod teeth, this is a shed tooth, likely lost during feeding.2 This specimen has exquisite preservation with the enamel texture sharply retained as in life. It however has minor weathering with possible feeding wear at the tip, light root etching, and the base of the tooth has been lightly smoothed possibly by tumbling in an ancient river (enamel is harder so it wouldn't have weathered as much as other portions of the tooth). References 1. Smith, Joshua B. “Heterodonty in Tyrannosaurus Rex: Implications for the Taxonomic and Systematic Utility of Theropod Dentitions.” Journal of Vertebrate Paleontology, vol. 25, no. 4, 2005, pp. 865–87. JSTOR, http://www.jstor.org/stable/4524513. 2. Fiorillo, Anthony R., and Philip J. Currie. “Theropod Teeth from the Judith River Formation (Upper Cretaceous) of South-Central Montana.” Journal of Vertebrate Paleontology, vol. 14, no. 1, 1994, pp. 74–80. JSTOR, http://www.jstor.org/stable/4523546.
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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. -
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). -
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). -
HELP! Please help me identify it.I am not sure it is t-rex or nanotyrannus .the tooth from the Hell Creek Formation of Dawson County, Montana. THANKS
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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. -
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). -
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). -
From the album: Hell Creek / Lance Formations
A Tyrannosaur tooth from Eastern Montana. Given the basal "pinching," this would be Nanotyrannus lancensis if it's valid (otherwise it's T. rex). Interesting to compare it to my other small Tyrannosaur teeth. The tip was probably broken after fossilization, but the gouges on the labial face may be inflicted while the tooth was in use. Note that the enamel is well-preserved with sharply resolved texture and is still clear. -
From the album: Hell Creek / Lance Formations
Tyrannosauridae (Cf. Tyrannosaurus rex) Hell Creek Fm., Wibaux Co., MT, USA This minute tooth is indeed Tyrannosaur: the mc/dc serration densities are virtually identical, and the denticle shape is not like those of Dromaeosaurids. It also has a slight pathology near the tip. -
From the album: Hell Creek / Lance Formations
Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA The CHR suggests a posterior position for this somewhat beat-up T. rex tooth.-
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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 comments
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From the album: Hell Creek / Lance Formations
Tyrannosaurus rex Hell Creek Fm., Carter Co., MT, USA More information Art by RJ Palmer-
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Hell Creek Formation Juvenile Tyrannosaurid Teeth
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
A juxtaposition of the bases of two juvenile Tyrannosaurid tooth crowns from the Hell Creek Formation. Nanotyrannus: Dawson Co., MT Tyrannosaurus: Carter Co., MT- 1 comment
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From the album: Dinosaurs
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Juvenile T. rex maxillary tooth basal cross section
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Fm., Wibaux Co., MT, USA Minor compression, common in maxillary teeth. It closely matches my larger juvenile T. rex. -
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA Not in the best shape, but a clearly robust tip with some feeding wear. -
Juvenile T. rex tooth mesial serrations (2)
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
