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 (all greatly magnified). All from Plate 1 of USGS Professional Paper 1047. Figures 1-6 and 11 Bristolia anteros. "Figures 1 cephalon stage I; Figure 2 caphalon stage II; Figures 3-6 cephala, stage III. Figure 11 cephalon, latex cast of holotype caphalon." Grapevine Mountains. All specimens from the Lower Cambrian Olenellus Zone.