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Troodon

ID on Micro Hell Creek Fm - Marine

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Troodon

I was going through some matrix, from my last dinosaur dig trip, using a microscope to look for anything small.   In that process I found something real small :blink:  a micro. 

 

Its slightly larger than 1 mm.   One of the smallest fossils I've ever found.

 

Cephalic hook, dermal denticle or something else?   

Hell Creek Formation, South Dakota

 

Any input would be appreciated.   Sorry its the best picture I can take with my digital scope.  Two images with a little different contrast.

Thank you for looking.

 

HCUnk1.jpgHCUnk1a.jpg

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jpc

troodon- I am pretty sure this is a dermal denticle of a ray.  I find them occasionally.  they are so small that they generally pass through any screens I use, so, like this one, I find them on a wee bit of matrix.  

 

edit:  I will go with ophis's opinion.  Let's call it a squatirhina.  

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jpc

now that I think about it, the ray dermal denticles are much more conical... like little recurved triangles on a wide base.  

 

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Canadawest

Good spotting!

You may or may not be familiar with the GSA 'Special Paper 361' from 2002 on the Biostratigraphy of vertebrate remains in the Hell Creek Formation of the Dakotas.

The study is quite broad and likely has a collecting bias but it provides a starting point.

 

I find the study useful in identifying  the relative abundance of specimens found in various types of deposits (channel, etc.)  This way,  if I recognize the visible macro fossils,  I have some sense what might be associated with them when looking at associated matrix under the scope.  I've found similar specimens and call them 'Squatirhina' but I'm not that knowledgeable of shark teeth.  I only have a few specimens so not sure if they are rare or just rarely found.

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Troodon

I have that publication just did not look like a dummy and there is a picture of one in there.  Like Opisthotriton said very common and because of size rarely found and I can vouch for that.

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