During the Pre-Cambrian era, there was a large depression in which the sediment was deposited and a block of crystal rocks known as the Peninsular Plateau came out and never submerged again. It is made up of crystalline, hard, igneous and metamorphic rocks. Most geologists believe that the Indian Peninsula is a part of the global Gondwanaland which broke away about 250 million years ago and started drifting northwards, striking the Central Asiatic plate raised up to form the high Himalayas out of the Tethys Sea.
