Dino Dad 81 Posted January 9, 2023 Share Posted January 9, 2023 Cracking open Heterodonty in T Rex for Joseph's tooth was fun enough that I wanted to take a look at this tooth and see if you have any suspicions on position @Troodon. From the Lance formation in Weston, WY CH: About 45-46mm CBL: 21.4mm CBW: 15.5mm Mesial Serration Density: 1.8/mm Distal Serration Density: 1.9/mm Thanks!! Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 9, 2023 Author Share Posted January 9, 2023 (edited) Just to double check. I measured the base where the black lines are. But, given the placement of carinae (shown in red), should I have measured the base where the blue lines are? Thanks, Edited January 9, 2023 by Dino Dad 81 Link to comment Share on other sites More sharing options...
Troodon Posted January 9, 2023 Share Posted January 9, 2023 I think its a Maxillary tooth, hard for me to say more. CBR's vary too much to over analyze it. 1 Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 9, 2023 Author Share Posted January 9, 2023 My guess was Maxillary 5 or possibly 2, based on the pics below. But, as you said, variation makes it silly to go this far. @Troodon what growth stage are you thinking? THANKS! Link to comment Share on other sites More sharing options...
Troodon Posted January 9, 2023 Share Posted January 9, 2023 You cannot use teeth to determine growth stages of tyrannosaurs. So much variation because of erupting teeth. 1 1 Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 9, 2023 Author Share Posted January 9, 2023 Hope you don't mind one more question @Troodon. Could something this size even possibly come from an adult or can we rule out adult? Link to comment Share on other sites More sharing options...
Troodon Posted January 9, 2023 Share Posted January 9, 2023 Diameter looks a bit small but who knows just look at Rmx4 and 2 in the above photo 1 Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 10, 2023 Author Share Posted January 10, 2023 @Troodon, sorry one last thing.. MY very first pic of the tooth posted above made me realize how much more cleaning can be done to it. Is it safe to say it hasn't been consolidated either? Seems like something to consolidate, agreed? Link to comment Share on other sites More sharing options...
Troodon Posted January 10, 2023 Share Posted January 10, 2023 The first photo shows what appears to be matrix on the one side. So definitely could benefit from additional cleaning including the base. The third photo down shows a shiny area by the carina so it might have some consolidant. Put a little acetone in an area see if it becomes tacky. But you should assume it hasn't been and with the hydration cracks its definitely needed. Edit see if a cotton swab in acetone easily removes that deposit. 1 Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 10, 2023 Author Share Posted January 10, 2023 @Troodon, would "tacky" be good or bad? By tacky, I assume you mean, a little moist/sticky when touched after the acetone? Link to comment Share on other sites More sharing options...
Troodon Posted January 10, 2023 Share Posted January 10, 2023 Tacky means that some consolidant has been used, your softening it. 1 Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 10, 2023 Author Share Posted January 10, 2023 Just to be sure, we're talking nail-polish remover? Or is it a different % acetone? Link to comment Share on other sites More sharing options...
Troodon Posted January 10, 2023 Share Posted January 10, 2023 Needs to 100% pure Acetone. It might be used as nail polish remover in some containers Link to comment Share on other sites More sharing options...
Styles Posted January 10, 2023 Share Posted January 10, 2023 I saw you listed serration density. Tried google but wasn't able to find the answer: Is the number of serrations fixed over the lifetime of the animal? Or lifetime of the tooth? Or neither? ie. as the animal grows and its teeth are replaced by larger ones, do they have the same number of serrations, which in turn would yield a lower density? If so, is this a helpful control for age/size when determining tooth position? Link to comment Share on other sites More sharing options...
Dino Dad 81 Posted January 10, 2023 Author Share Posted January 10, 2023 @Styles Serration density changes as the animal matures and the teeth get bigger. It seems common to come across things like a juvenile having, say, 3/mm if the corresponding adult would be expected to have 2/mm. I'm yet to come across any theropod exceptions to that, but I've never definitively heard there are no exceptions. I suspect serration density DOES stay constant over the life of the tooth. Link to comment Share on other sites More sharing options...
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