Zacanthoides typicalis
Middle Cambrian
Pioche Formation
Pioche
Nevada, USA.

Fossils of Zacanthoides typicalis are most famously associated with the legendary Burgess Shale and related Cambrian marine deposits in western North America. These ancient environments were part of warm shallow seas teeming with early complex animal life shortly after the Cambrian explosion.
31mm part and counterpart on 89mm slab