Zenmaster6 Posted February 25, 2021 Share Posted February 25, 2021 Pleistocene Texas coast 2nd might be wood but might be horn / tusk Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 25, 2021 Author Share Posted February 25, 2021 For size. Link to comment Share on other sites More sharing options...
Brett Breakin' Rocks Posted February 25, 2021 Share Posted February 25, 2021 11 minutes ago, Zenmaster6 said: For size. Hi There .. this is a Carcharhinus sp. or a "Bull" shark in collector speak. But honestly these teeth can be associated with Bull/Dusky/Silky sharks etc .. and they all look very similar to one another. Cheers, Brett 1 Link to comment Share on other sites More sharing options...
PaleoNoel Posted February 25, 2021 Share Posted February 25, 2021 Tooth is Carcharhinus sp. and the bone is probably indeterminate. Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 25, 2021 Author Share Posted February 25, 2021 1 minute ago, PaleoNoel said: Tooth is Carcharhinus sp. and the bone is probably indeterminate. You think its a bone? or could it be horn / tusk. Im not seeing the regular pourous structure on the edges Link to comment Share on other sites More sharing options...
PaleoNoel Posted February 25, 2021 Share Posted February 25, 2021 Just now, Zenmaster6 said: You think its a bone? or could it be horn / tusk. Im not seeing the regular pourous structure on the edges Yeah I think it's just regular bone. If it were tusk there wouldn't be that cancellous structure on the inside, while horn cores typically have grooves and additional holes on the outside to feed the keratinous tissue covering it. 1 1 Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted February 25, 2021 Share Posted February 25, 2021 Agreed on Carcharhinus and agreed on bone. Diving a bit more into the Carcharhinus, the large toothed Carcharhinus species are very similar as Brett mentioned above. In part C. falciformis and C. obscurus can be differentiated by the coarseness and irregularity of their serrations when compared to C. leucas. The foramina is in the upper part of the root in C. leucas as well compared to it being comparatively lower in C. obscurus. Despite this they can still be difficult to tell apart. I think I see the remains of the foramina in the upper portion of the root although it is worn and I'm not certain from the photo. I'd lean towards C. leucas based on the serrations but I'd feel better if the foramina matched as well. Elasmo has a page on differentiating C. leucas and C. obscurus with photos illustrating the characteristics I mentioned above. Elasmo Link 2 Link to comment Share on other sites More sharing options...
PrehistoricWonders Posted February 26, 2021 Share Posted February 26, 2021 First is a bull shark tooth. I think the second is an unidentifiable bone fragment. Link to comment Share on other sites More sharing options...
hemipristis Posted February 26, 2021 Share Posted February 26, 2021 Concur w/ C. leucas. Blade shape, serrations, and the placement of the foramen 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
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