Early and Mid Cambrian trilobites from the outer‐shelf deposits of Nevada and California, USA

A latest Early Cambrian and earliest Mid Cambrian polymeroid trilobite fauna, consisting of 16 genera and 25 species, is reported from the peritidal deposits of the Mule Spring Limestone and outer‐shelf deposits of the Emigrant and Monola formations of Nevada and California. The Mid Cambrian fauna includes a new genus, Tonopahella, and four new species, T. goldfieldensis, Oryctocephalus americanus, Onchocephalites claytonensis, and Syspacephalus variosus. The peri‐Gondwana species Oryctocephalus orientalis, Oryctocephalites runcinatus, and Paraantagmus latus are recorded in Laurentia for the first time.