TRexEliot Posted May 21, 2023 Share Posted May 21, 2023 My brother found this tooth years ago at big brook. It looks reptilian to me, and seems to have the root preserved as well. 1 Link to comment Share on other sites More sharing options...
jikohr Posted May 21, 2023 Share Posted May 21, 2023 Nice find! I could be completely wrong, but it looks like a sawfish rostral tooth to me. Croc and Mosasaur don't have that bulge at the base of the enamel I don't think. And the base that is there doesn't look like croc or Mosasaur roots, but does look like a broken sawfish base. Here's a pic of Sawfish teeth from Big Brook from fossilguy.com who has a bunch of Big Brook examples. Then a Mosasaur tooth (Thalassotitan atrox) and a croc tooth (Elosuchus) for comparison (those two are from me). Ischyrhiza mira from Big Brook Thalassotitan atrox from the Moroccan Phosphates Elosuchus cherifiensis Kem Kem Beds (technically a Crocodylomorph but same characteristics) 1 1 Link to comment Share on other sites More sharing options...
TRexEliot Posted May 21, 2023 Author Share Posted May 21, 2023 Rostral tooth crossed my mind, but why is it so curved and round? I've never seen one this shape Link to comment Share on other sites More sharing options...
jikohr Posted May 21, 2023 Share Posted May 21, 2023 9 hours ago, TRexEliot said: Rostral tooth crossed my mind, but why is it so curved and round? I've never seen one this shape It could be from a different species besides mira or from a different position than the typical long and flat ones since mira had multiple shapes and sizes. As far as that I have no idea. Hey @ThePhysicist @Al Dente you guys are really good with Cretaceous Chondrichthyes. What are your thoughts? Link to comment Share on other sites More sharing options...
frankh8147 Posted May 22, 2023 Share Posted May 22, 2023 I'm leaning towards mammal (most likely modern) on this one. It doesn't look reptilian and doesn't look like any sawfish rostral I've seen. Here are some of mine, for comparison. Link to comment Share on other sites More sharing options...
Carl Posted May 22, 2023 Share Posted May 22, 2023 I have to go with Ischyrhiza on this one. It's beat up and not a typical shape but it has the acrodin tip and the slight rim at the base of the enameloid. Not seeing a reptile or mammal. 2 2 Link to comment Share on other sites More sharing options...
ThePhysicist Posted May 23, 2023 Share Posted May 23, 2023 I'm on team weathered sawfish rostral tooth. 1 "Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan "I was born not knowing and have had only a little time to change that here and there." - Richard Feynman Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | Squamates | Post Oak Creek | North Sulphur River | Lee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone Instagram: @thephysicist_tff Link to comment Share on other sites More sharing options...
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