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Are these Tyrannosaurus Rex teeth?


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These are all found in what I believe is the scollard formation at roughly the same elevation. The black one is what appears the least "Rex-like" to me. 

@Troodon

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Troodon

If you are positive I'm they are from the scollard they are all Trex

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Troodon

The black one would be a maxillary tooth the others dentary

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Posted (edited)

I'm quite positive that they were all found in the scollard. Is the black one from a juvenile rex then?

 

The maxillary/dentary distinction is made based on whether the root shape is rectangular or ovular, correct?

Edited by dingo2
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Troodon

You have not provided any sizes so its hard to say

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Troodon

Sorry cannot see anything what's the size

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1 minute ago, Troodon said:

Sorry cannot see anything what's the size

The scale is the pad that they're sitting on which has a grid in cm. The largest is ~7cm in length. Is there something else I should be measuring?

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Troodon

At that size they all could be considered juvenile but could be replacement teeth from adults.   Let me make an observation, I've not seen many Trex teeth from the Scollard but the serration density on these teeth look pretty fine for Trex.  

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1 minute ago, Troodon said:

At that size they all could be considered juvenile but could be replacement teeth from adults.   Let me make an observation, I've not seen many Trex teeth from the Scollard but the serration density on these teeth look pretty fine for Trex.  

I can take better pictures with scale if you want to look at serration density

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These are all from the backside of the tooth. Not sure if that matters. Scale is in mm. 

 

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Posted (edited)

I counted 20, 19, and 22 serrations/cm. Higher density as the teeth get bigger.

Edited by dingo2
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Troodon

Serration density is measured over 5 mm at the midline of the tooth on both carinae.  I would expect something less than 2/mm to clearly say its a Trex tooth but Ive seen them higher.   However location is the primary identifier of Tyrannosaurid teeth

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