Paragraph on Archaean Rock System of India

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 [...]