Trilobites
Order Ptychopariida Suborder Ptychopariina, Superfamily
Ptychparioidea,
Family Alokistocaridae
Geologic Age: Middle Cambrian
Trilobite 50 mm long
Marjum Formation, House Range, Utah
Comment: An uncommon (and often larger) Marjum Formation trilobite.
Also see: US Trilobites
