Ptyocephalus
yersini
Trilobites
Order Asaphida, Family Asaphidae, Subfamily Ptyocepalinae
Geological
Time: Ordovician
Size: Trilobite
15 mm long by 8 mm wide on a 35 mm by 20 mm matrix
Fossil Site:
Fillmore Formation, Millard County, Utah
Description:
Utah (as well as other Western States) is well known for its Cambrian
fauna and trilobites in particular. Trilobites from the Ordovician
also occur but in far fewer exposures. In Utah, the Fillmore, Garden
City, Pogonip, Swan Peak, and Wah Wah Formations yield Ordovician
trilobites. No trilobites from Utah are known that are younger than
the middle Ordovician. This trilobites comes from my own lease in
the lower, middle Ordovician Fillmore formation. These trilobites
are not commonly offered. Ptyocephalus yersini is normally found
enrolled, making this a most unusual and thus highly desirable specimen.
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