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Shellfish fossil?

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Found this one in northern AZ. Couldn't find anything that resembles this online. Anyone have an idea?






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DPS Ammonite

It sort of looks like two stacked productid brachiopods. 

A better locality and knowledge of the rock layer that they came from will help. 

See county geological maps of Arizona at top of this post:



My best guess is that they are Peniculauris bassi  brachiopods from the Permian Kaibab Formation. 


Edited by DPS Ammonite
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