Figure 3. Composite stratigraphic section of the Cambrian rocks of the Parahio, Karsha, and Kurgiakh Formations in the Zanskar Valley, Ladakh region, with microfossil occurrence, local ranges shown, and trilobite biozonation. Unzoned intervals refer to relatively thick intervals of section that yielded no trilobites. Measured sections containing material described herein are indicated. PU, Purni; KU, opposite Kuru. (5) The informal fifth stage of the Cambrian System. sh, shale; ss, sandstone; carb, carbonate.