Q. Damodar and Sone river valley and Rajmahal hills in the eastern India are depository of the______?
Answer: Gondwana System Rocks
Notes: Gondwana Rock System comprises the major coal deposits of India. This system contains famous Damuda and Panchet series which are famous for coal deposits (discussed below). The important coal bearing areas of this series are Raniganj, Jharia, Karanpur, and Bokaro of the Damodar basin in Odisha, and the Pench valley in Chhattisgarh and Madhya Pradesh, the jhingurda coal seam (Chhattisgarh).

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