Trilobites Figured From United States Geological Survey Professional Paper 1047, Physical Stratigraphy and Trilobite Biostratigraphy of the Carrara Formation (Lower and Middle Cambrian) in the Southern Great Basin, by Allison R. Palmer and Robert B. Halley

Trilobites from the Lower-Middle Cambrian Carrara Formation, Death Valley National Park. Figures 23-24 are from Plate 10, while Figures 14-15 are from Plate 11; all specimens are greatly magnified. Middle Cambrian Albertella zone. Figures 23-24, Mexicaspis radiatus, holotype pygidium and a cranidium, respectively, from the Titantothere Canyon section, Grapevine Mountains. Figures 14-15, Ptarmiganoides hexacantha; Figure 14, a cranidium; Figure 15, "top profile view of holotype specimen" from the Titantothere Canyon section, Grapevine Mountains.