Phillipsia peroccidens cranidium / glabella
By Arizona Chris
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Here you can see the both the upper and lower surfaces of this rare trilobites cranidium. There is much debate as to what the actual tubercles were used for - sensory, camouflage, or defense. This pair of fossils were found on the Mogollon Rim in northern Arizona near the town of Young.
Arizona Chris
From the album:
Mississippian Redwall Limestone Fossils, Arizona
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