The Lower Cambrian of the Salair and Gorny Altai (Siberia) revisited Nikolay V. Sennikov, Igor’ V. Korovnikov, Olga T. Obut, Dmitry A. Tokarev, Natalya V. Novozhilova and Taniel Danelian Bull. Soc. géol. Fr., 188 1-2 (2017) 1 Published online: 02 June 2017 DOI: 10.1051/bsgf/2017002