|The geology of India is varied and its features are categorised based on the period of formation. The Precambrian formations of Cudappah and Vindhyan systems, the Paleozoic formations from the Cambrian, Ordovician, Silurian and Devonian system, Oligocene formations and the Mesozoic Deccan Traps formation are some of the period of formation of the Indian geology.
The Carboniferous system, Permian System, Triassic and Jurassic systems are seen in the western Himalayas. The Gondowana system is seen in the Narmada River. The Eocene system is seen in the western Himalayas and Assam. The Pleistocene system is found over central India. The Andaman and Nicobar Island groups are believed to have formed in the era by volcanoes.