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

46 5 Wed, 01/01/2003 - 12:00 September 945 986 10.1111/1475-4983.00328

SUNDBERG, F. A., MCCOLLUM, L. B. 2003. Early and Mid Cambrian trilobites from the outer-shelf deposits of Nevada and California, USA. Palaeontology, 46, 5, 945–986.

Frederick A. Sundberg and Linda B. McCollum 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. Wiley Online Library