The document discusses the major rock formations in India, including the Archaean, Cuddapah, Vindhyian, and Gondwana systems. It provides details on the lithology, structure, occurrence, economic minerals, and use of building stones for each system. The Archaean system includes the oldest metamorphic rocks and occurs over two thirds of peninsular India. The Cuddapah system derives from a basin in Andhra Pradesh and contains quartzites, slates, and limestones. The Vindhyian system unconformably overlies the Archaean or Cuddapah systems and contains sandstones, slates, and limestones. The Gondwana system ranges from