Which one of the following is the appropriate reason for considering the Gondwana rocks as most important of rock systems of India ?

The Gondwana rock system is regarded as India’s most important rock system primarily because it hosts the vast majority of the country’s coal reserves. Standard geological texts state that the Gondwana formations provide over 95% of India’s coal, making them the principal source of fuel and industrial coal fields such as Raniganj, Jharia, Bokaro and others occur in these Gondwana basins [2]. Educational and university sources similarly quantify Gondwana coal as about 98% of reserves and nearly all production, underscoring its economic significance for energy and industry in India [3]. The predominance of coal in Gondwana rocks, rather than limestone or black cotton soils, is therefore the correct rationale.

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 1: Geological Structure and formation of India > Panchet Series > p. 18
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 8: Energy Resources > Classification > p. 1
3. [3] https://mlsu.ac.in/econtents/1895_Distribution%20of%20Coal%20&%20Petroleum%20in%20India.pdf