Trilobites
Order Ptychopariida Suborder Ptychopariina, Superfamily Ptychopariacea,
Family Alokistocaridae
Geologic Age: Upper Cambrian
Trilobite is 16 mm long
Walsey Formation, Bear Tooth Lake, Montana
Comment: Montana trilobites are seldom seen. The genus Ehmaniella also
comes from the Burgess Shale.
Also see: United States Trilobites
