Solution:The Archean is the second of four geologic aeons of Earth's history, representing the time from 4,000 to 2,500 million years ago. The Archean rocks in India are called Purana Rocks means the oldest rocks. The Archean rock system in India is found in Aravallis Mountains, two-thirds of the Deccan peninsula and some parts of north east.These rocks have abundant metallic and non-metallic minerals such as iron, copper, manganese, bauxite, lead, zinc, gold, silver, tin, tungsten, mica, asbestos, graphite, etc.