Prismocorollina Sp. From the Early Ordovician Thango formation of Tidong Valley, Kinnaur Tethyan Himalaya, Himachal Pradesh

Well preserved, though rare occurrence of Chlorophyceae algae of genus Prismocorollina sp in one of the maroon coloured silty shale microfacies from the Thango Formation reveals that the deposition sediment took place in a shallow marine in adequately oxygenated, Warm-and climatic condition during the Early Ordovician time In the Tidong valley, Kinnaur Tethyan Himalaya.