dinosaur man Posted April 7, 2019 Share Posted April 7, 2019 (edited) On my birthday I got a juvenile gorgosaur tooth didn’t look special other then the colour but then I started to check it out and study it and instead of serrations there were small holes so I came up with a theory how juvenile tyrannosaurs didn’t have serrations until they got older yet I still need more proof to back up my theory but I found it interesting it was collected on a ranch in the Judith River formation not to far from the Canadian border it is 75 million years old here are some photos of it. Edited April 7, 2019 by dinosaur man Link to comment Share on other sites More sharing options...
Troodon Posted April 7, 2019 Share Posted April 7, 2019 The serrations are missing because the tooth is simply very worn.. Serrations are present in very small Tyrannosaurid teeth. Where was this tooth found? Tyrannosaurid teeth from the Judith River Formation of Montana cannot be distinguished between one another. They can be either Daspletosaurus or Gorgosaurus 1 Link to comment Share on other sites More sharing options...
dinosaur man Posted April 7, 2019 Author Share Posted April 7, 2019 (edited) I can tell it’s a gorgosaur because the cross section the tooth is also 2 cm Edited April 7, 2019 by dinosaur man Link to comment Share on other sites More sharing options...
Troodon Posted April 7, 2019 Share Posted April 7, 2019 The shape of the cross-section of the tooth at the base is more a function of the tooth position in the jaw and not an indicator of species. Juvenile campanian tyrannosaurid teeth cannot be distinguished between one another. A paper that explored the difference between small Albertosaurus, Daspletosaurus and Gorgosaurus came to this conclusion : "In summary, although the teeth of tyrannosaurid dinosaurs must belong to one of five types based on position of teeth in the bones of the jaws, it is difficult to quantifiably distinguish these teeth reliably by taxon. https://www.researchgate.net/publication/261630184_Morphometry_of_the_teeth_of_western_North_American_tyrannosaurids_and_its_applicability_to_quantitative_classification 2 Link to comment Share on other sites More sharing options...
dinosaur man Posted April 8, 2019 Author Share Posted April 8, 2019 What type of tyrannosaur tooth is this it’s 75 million years old and is from the Judith River formation it’s from a juvenile and is 2cm? Link to comment Share on other sites More sharing options...
JohnBrian Posted April 8, 2019 Share Posted April 8, 2019 Troodon's guide should still work for Judith. ---------------------------------------------------------------------------- John I had a friend once, but the wheels fell off. Sad, very sad. - Nightwing Link to comment Share on other sites More sharing options...
fossilsonwheels Posted April 8, 2019 Share Posted April 8, 2019 You will probably find it is Tyrannosaur indet. You can not distinguish the small Tyrannosaur teeth from Judith River or at least that is what I understand. Link to comment Share on other sites More sharing options...
dinosaur man Posted April 8, 2019 Author Share Posted April 8, 2019 Ok Link to comment Share on other sites More sharing options...
-Andy- Posted April 8, 2019 Share Posted April 8, 2019 If it's from JRF then you could label it as 'Daspletosaurus/Gorgosaurus sp.' Looking forward to meeting my fellow Singaporean collectors! Do PM me if you are a Singaporean, or an overseas fossil-collector coming here for a holiday! Link to comment Share on other sites More sharing options...
Troodon Posted April 8, 2019 Share Posted April 8, 2019 Why is this being reposted the answer does not change You say its from the JRF but is it not a Canadian tooth or one from Montana? Link to comment Share on other sites More sharing options...
Fossildude19 Posted April 8, 2019 Share Posted April 8, 2019 Topic moved to Fossil ID, and merged with previous post. @dinosaur man Please do not post the same fossil multiple times. You have already received the best answer possible. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
dinosaur man Posted April 8, 2019 Author Share Posted April 8, 2019 I have one more it’s from North Shore Drive Lowbanks Dunnville Ontario it’s from the Devonian period sorry it’s not sharp thats the best I could take Link to comment Share on other sites More sharing options...
dinosaur man Posted April 8, 2019 Author Share Posted April 8, 2019 troodon i think its from canada or the more northen parts of montana but prety sure southern alberta Link to comment Share on other sites More sharing options...
dinosaur man Posted April 8, 2019 Author Share Posted April 8, 2019 a little bit of the Judith river formation is in Canada not much if you were to drive it it would only be about 15 minutes till the Judith river formation ends Link to comment Share on other sites More sharing options...
Troodon Posted April 8, 2019 Share Posted April 8, 2019 Just for your info here are the formation designation in Alberta. Judith River Fm is now only used for Montana and Belly River Group for Canada and comprises the Oldman, Dinosaur Park and Foremost Fm 2 Link to comment Share on other sites More sharing options...
dinosaur man Posted April 9, 2019 Author Share Posted April 9, 2019 Then it’s from Canada Link to comment Share on other sites More sharing options...
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