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Unknown vertebrate from upper kootenai formation (gastropod beds) in the block mountain area outside of Dillon Montana.


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Hello all. I was hoping for additional insights on what this may be as well. I know this is a vertebrate bone of Cretaceous age found near block mountain outside of Dillon Montana during a classical  mapping trip. 


On one side of the specimen there is a prominent yet thin plate of bone with a robust ridge along one margin. On the opposite side of the specimen is a rectangular structure which may be a scute or possibly another type of mineralized structure. Any insights are appreciated. 







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Hard to tell from the photos.

How small are they?


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