The Damuda series of Gondwana system has three stages, namely, Raniganj, Barren Rocks, and Barakar. The middle stage is called Barren because
it consists of coal and not iron
it consists of iron and not coal
it consists of neither coal nor iron
it is a sedimentary layer consisting of shale and clay
B.
it consists of iron and not coal
In the Damodar series of Gondwana cistern, Raniganj and Barakar has coal reserves whereas Barren Rocks have iron reserves
