Problems of Lower Cambrian paleontology and biostratigraphy of Siberia and Far East. New data on Early Cambrian biostratigraphy of Bograd-settlement environs (Batenevsky Mountain Range). Rossiiskaya Akademiya Nauk Sibirskoe Otdelenie Trudy Instituta Geologii i Geofiziki, 49 1973: 119-151. 135 [Zoological Record Volume 115]