Structure and Physiography
India's geological divisions
Compare the three geological divisions of India.
The earth is about 4,600 million years old; India's structure came from endogenic and exogenic forces and plate movement.
Peninsular Block: ancient gneisses and granites, rigid since the Cambrian; relict hills; shallow valleys; rift valleys of the Narmada, Tapi, Mahanadi.
Himalayas: young, weak and flexible; faults, folds; youthful rivers with gorges.
Indo-Ganga-Brahmaputra plain: a filled geo-synclinal depression; alluvium 1,000-2,000 m deep.
Old and rigid south, young and folded north, filled trough between.
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