This paper is an expansion of Charles D. Walcott's project of describing a Lower Cambrian subfauna' from the Mount Robson area. The paper demonstrates that Walcott's fossils came from two zones, and that the area of research is unfinished. It describes previous investigations in this area of Mount Robson and the local biostratigraphy and locality 61k, and regional correlations. It then presents a systematic paleontology of the family Olenellidea, the family Nevadiidae, and the family Wanneriidae.