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Cretaceous Hell Creek Microfossil ID


JackS

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Hey Everyone, Im new here and have a project for my high school science research class in high school. I have been analyzing microfossils from the Hell Creek Formation in Southern Montana and have been determining what species my specimens are from through published papers. There are some specimens however that I have not been able to determine, and have attached below. If you wouldn't mind helping me out, it would be greatly appreciated! 

Ps my apologies for no scale!

The first two pictures are the same, looks like a pygostyle almost. Is 1mm long by 500 microns. The third photo I have no clue what it could be and is 1.5 mm by 800 microns. The fourth I think is dermal from a gar or a multituberculate part is 1.2 mm by 900 microns. Fifth I have no clue and is 2mm by 1mm. Final and most exciting is the lower jaw, the diameter of the pencil lead is 700 microns. about 3mm long and 1.2 mm wide. I believe it is mammal or amphibian but am not sure. 

Thanks :)

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The two previous IDs are correct.  Excellent multituberculate tooth, by the way.  They are not common and this one looks complete.  Hard to say if it is a lower molar or an upper without being able to see all the little cusps. 

 

The first one is a half of an amphibian centrum.   

 

The fourth photo, with four little semi-rounded teeth is a piece of pharygeal plate of a fish... perhaps Paralbula.  

 

Fun stuff.  

Edited by jpc
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23 minutes ago, jpc said:

The two previous IDs are correct.  Excellent multituberculate tooth, by the way.  They are not common and this one looks complete.  Hard to say if it is a lower molar or an upper without being able to see all the little cusps. 

 

The first one is a half of an amphibian centrum.   

 

The fourth photo, with four little semi-rounded teeth is a piece of pharygeal plate of a fish... perhaps Paralbula.  

 

Fun stuff.  

Amazing! Thanks for the help. Stay tuned for more interesting finds!

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11 hours ago, jdp said:

Last one looks like a multituberculate molar

Hm interesting. A friend said more amphibian, and we thought it was the whole jaw. Thanks for the help!

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Nothing about that element looks amphibian, and I've seen a decent amount of north american Maastrichtian frog, salamander, and albanerpetontid

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2 hours ago, jdp said:

Nothing about that element looks amphibian, and I've seen a decent amount of north american Maastrichtian frog, salamander, and albanerpetontid

Ok thanks!

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