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Afghanistan Andaman anticline assemblage bands basal basin beds belt Bhutan biotite boulders Buxa calcareous carbonaceous carbonate Carboniferous Central chlorite clay colour comprises conglomerate conodonts consists correlation Cretaceous crystalline Daling Darjeeling Deoban deposits Devonian district dolomite Dul quartzite exposed facies fault fauna folds Formation fossiliferous fossils Geol Surv Ind geological mapping Geological Survey glacial gneisses Gondwana grade grained granite graphitic grey Group Himalaya Hipparion Kameng Karewas Kashmir Kishtwar Krol kyanite limestone Lower Mandhali marble metamorphism metres mica Middle mineral Muth quartzite occur overlain overlying Palaeozoic Panjal trap Paro pebbles Permian phyllite Plate Pradesh Precambrian present quartz quartzite Ralakung Rec Geol Surv region river rocks Salkhala sand sandstone schist sedimentary sediments sequence Series shale Siang siltstone Silurian Simla Siwalik slate species Spiti stratigraphic stromatolites structure Subansiri Survey of India syncline tectonic terraces thick Thimphu Thimphu gneissic thrust Triassic unconformity units Upper upto valley volcanic zone