Trilobites
Order Ptychopariida Suborder Ptychopariina, Superfamily Ptychopariadea,
Family Alokistocaridae
Geologic Age: Early Middle Cambrian
Trilobite is 21 mm long
Stephen Formation, Burgess Shale, Burgess Pass, British Columbia, Canada
Comment: The genus Ehmaniella also
comes from the Montana in the United Sates.
Also see: Canadian Trilobites
