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appears Aravalli Archaean Assam bands basal base basin beds Boulder Brachiopods brown calcareous Carboniferous Central characteristic clays close coal colour composed comprising conglomerates consists containing covered Cretaceous Cuddapah dark deposits developed Dharwar district divided division dolomitic east eastern Eocene exposed extended facies fauna feet thick ferruginous folding formations formed fossils geosyncline gneiss Gondwana granite grey hills Himalayas important India indicating intercalated intrusion Jurassic Kashmir known Kumaon Laki Lamellibranchs land later layers limestone Lower marine marks measuring Middle miles movement Nagpur named northern Nummulites occur origin outcrops overlain overlying pass Peninsular period Permian phyllites plant plateau Pleistocene present Productus purple quartzites region represented rest rocks Salt Range sandstone schists sediments seen separated shales Siwalik slates southern Spiti stage succeeded succession System TABLE thin trap types unconformity unfossiliferous Upper valley western Windhyan zone