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Can't identify if these are triceratops or hadrosaur teeth


-Andy-

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Hi all, I have a group of dinosaur teeth that needs identifying. They are either triceratops or hadrosaur teeth. They come from Hell Creek Formation of Powder County, Montana.

 

All the teeth are roughly 1.5 cm tall

 

1) I am guessing hadrosaur

 

2) I am guessing triceratops

 

3) I am guessing triceratops

 

4, 5, 6) These 3 are extremely similar. I can't tell what they are.

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Andy see if I can help you ID these type of teeth in the future.  

First take a look at hadrosaur teeth with roots on them, long and narrow and delicate.   No bone around the enamel crown area and the tip of the tooth typically is adjacent to another tooth.   The root is also brittle and hollow in the center so it rarely take odd shapes you see on ceratopsian teeth.  The crowns are very shallow although some may have high center ridges they don't typically wear to see those big triangles on your column #4 to #6.  Hadrosaur spitters are usually very small with a center ridge and flat on both sides and look like a hadro tooth.  I'm sure there are exceptions :D

 

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Ceratopsian teeth are much more robust and have bone around the base of the crown.  The arrow points to what I call a beard, you see  it in a number of  your teeth including the bottom two of column 1.  The back of the crown is typically deep, with some enamel, and can take those odd spitter shapes.   The crown also has a much higher center ridge that helps form those triangular shapes.   Most spitters you see belong to Ceratopsians.  

 

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