The Deccan Trap region of peninsular India is made up mainly of which rock?

The Deccan Traps were formed by massive volcanic eruptions of fluid lava at the end of the Cretaceous, which cooled into basaltic rock covering much of Maharashtra, Gujarat and Madhya Pradesh. Weathering of this basalt yields the black cotton soil. Granite is intrusive, limestone is sedimentary, and quartzite is a metamorphosed sandstone.