Trace Fossils Figured In 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, 1979

"Straight, superimposed, and bigrooved trails preserved on the undersides of siltstone beds. Such trails are characteristic of the base of the Pahrump Hills Shale Member, Pyramid Peak section, Funeral Mountains." Figures 10B and 10C. Lower Cambrian portion of the Carrara Formation.