Here is your paragraph on the Archaean rock system of India! The word ‘Archaean’ was first used by J.D. Dana for rock structure prior to the Cambrian system. Obviously the Archaean rocks are the oldest in the world. The Archaean rock system includes the following rock groups: (a) The Archaean System-Gneisses and Schists: These are the oldest rocks and were [...]
Here is your paragraph on the Aryan rock system of India (Gondwana System)! The Aryan System comprises the rock formations ranging from the Upper Carboniferous to Recent. They are fairly preserved in the Peninsular India and are found in a perfect sequence in the Himalayan region along the entire northern border. The Gondwana System derives its name from the Kingdom [...]
Here is your paragraph on the Purana rock system (Proterozoic) of India! In India, the word purana has been used in place of Proterozoic and includes two divisions the Cuddapah System and the Vindhyas. The Cuddapah System: A long interval of time elapsed before the rock system next to the Dharwars and Peninsular gneisses began to be deposited. A great [...]
Here is your paragraph on the Dravidian rock system (Palaeozoic) of India: The rocks of the Dravidian system came into being about 600-300 million years ago. Most rocks of this system are found in the Extra Peninsular region and they are conspicuous by their absence in the Peninsular India except for one or two small patches of lower Permian age [...]