Early Cambrian
Pioche Formation: c-Shale
Pioche, Lincoln County, Nevada, USA
Fine 0.6 inch negative on 3 x 2.5 inch shale.
Trilobite,

The genus, Olenellus, belongs to perhaps the most ancient trilobite group (Order Redlichiidia).  It lived only during Early Cambrian.

In the old days a lot of people used to go to Pioche because they could collect trilobites from a few different localities representing different ages.