In the northwest Himalayas, Cambrian sequences forming part of Tethyan Himalayan Zone are well preserved in Zanskar and Spiti regions. present work, we critically examine geologic, stratigraphic biostratigraphic aspects Kunzam La Formation exposed (i.e., Niri-Tsarap Chu Kurgiakh valleys) regions Chandra, Parahio, Pin Sumna valleys sections). Although is extensively developed, none sections from...