Praefectus Posted November 27, 2020 Share Posted November 27, 2020 Hello. I was wondering if anyone could help me identify this tyrannosaur tooth I recently added to my collection. It is said to be from the Judith River formation in North-Central Montana. Unfortunately, I don't have the county it came from. The tooth has the following measurements. Thanks for your help. CH = 40 mm CWB = 10 mm CBL = 16 mm MC = 18 denticles/5 mm DC = 14 denticles/5 mm DSDI = 1.29 1 1 Link to comment Share on other sites More sharing options...
Troodon Posted November 28, 2020 Share Posted November 28, 2020 Beautiful tooth. Without a more specific locality cannot definitely say much. Preservation on the surface looks JRF. If it is its a indeterminate Tyrannosaurid since none have been described from those deposits 3 Link to comment Share on other sites More sharing options...
Praefectus Posted November 28, 2020 Author Share Posted November 28, 2020 Thanks for the help. I thought there might have been a chance at a closer ID because of the Hendrickx et al 2019 paper. I'll label this one as Tyrannosaurid indet. for now. Hopefully something will get described in the near future. 1 Link to comment Share on other sites More sharing options...
Troodon Posted November 28, 2020 Share Posted November 28, 2020 Well you would need a described species to make a call. We have none 2 Link to comment Share on other sites More sharing options...
Troodon Posted November 28, 2020 Share Posted November 28, 2020 Let me add but I dont think this is a mesial tooth. And see final remark "depending on locality." From paper: If your tooth is from a Mesial position in the jaw and your DSDI is >1.2 your tooth may be considered a Daspletosaurus or cf Daspletosaurus depending on the locality of where it was found. 2 Link to comment Share on other sites More sharing options...
Praefectus Posted November 28, 2020 Author Share Posted November 28, 2020 This tooth would still be tyrannosaurid indet. even if it was mesial because there are not any tyrannosaurs described from Judith River fm., right? Curiously, do you have any idea which jaw position it came from? I don't know how to tell the different jaw positions apart. Thanks. 1 Link to comment Share on other sites More sharing options...
Fossil Maniac Posted November 19, 2021 Share Posted November 19, 2021 I recently picked up a Juvenile Tyrannosaur premax tooth from The Judith River Formation of Hill County Montana and was wondering if there was any way of identifying it without any present serration. Link to comment Share on other sites More sharing options...
Troodon Posted November 19, 2021 Share Posted November 19, 2021 54 minutes ago, Fossil Maniac said: I recently picked up a Juvenile Tyrannosaur premax tooth from The Judith River Formation of Hill County Montana and was wondering if there was any way of identifying it without any present serration. Post the tooth and will have a look. Some premax teeth do not have serrations Link to comment Share on other sites More sharing options...
-Andy- Posted November 19, 2021 Share Posted November 19, 2021 On 11/28/2020 at 8:51 AM, Praefectus said: This tooth would still be tyrannosaurid indet. even if it was mesial because there are not any tyrannosaurs described from Judith River fm., right? Curiously, do you have any idea which jaw position it came from? I don't know how to tell the different jaw positions apart. Thanks. I know you asked Frank but my guess is maxillary tooth near middle of jaw 1 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...
Fossil Maniac Posted February 16, 2022 Share Posted February 16, 2022 On 11/18/2021 at 8:18 PM, Troodon said: Post the tooth and will have a look. Some premax teeth do not have serrations Link to comment Share on other sites More sharing options...
Troodon Posted February 16, 2022 Share Posted February 16, 2022 @Fossil Maniac In the future, always best post a separate topic. What size is it but it looks like an indeterminate tyrannosaurid premaxillary tooth. You find them with and without serrations. Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted February 16, 2022 Share Posted February 16, 2022 Love your tooth, @Praefectus 1 Link to comment Share on other sites More sharing options...
Fossil Maniac Posted February 17, 2022 Share Posted February 17, 2022 11 hours ago, Troodon said: @Fossil Maniac In the future, always best post a separate topic. What size is it but it looks like an indeterminate tyrannosaurid premaxillary tooth. You find them with and without serrations. It's only about 0.85 inch Link to comment Share on other sites More sharing options...
Troodon Posted February 17, 2022 Share Posted February 17, 2022 7 hours ago, Fossil Maniac said: It's only about 0.85 inch Okay juvie Link to comment Share on other sites More sharing options...
Fossil Maniac Posted February 22, 2022 Share Posted February 22, 2022 On 2/17/2022 at 2:10 AM, Troodon said: Okay juvie Yeah. I forgot to mention that part. Link to comment Share on other sites More sharing options...
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