Trilobites
Order Ptychopariida Suborder Ptychopariina, Superfamily
Ptychoparioidea,
Family Marjumiidae
Geologic Age: Upper Middle Cambrian
Trilobite is 15 mm long
Weeks Formation, House Range, Millard County
Remarks: Note the prominentOpisthoparian
facial sutures,
a typical characteristic of the Ptychopariids.