Trilobites
Order Ptychopariida Suborder Ptychopariina, Superfamily
Ptychoparioidea,
Family Marjumiidae
Geologic Age: Upper Middle Cambrian
Trilobite is 32 mm long
Marjum Formation, House Range, Millard County
Remarks: Note how sharp and distinct are the pleural
spines.
Also see: American Trilobites
