The Deccan Traps formed during the late Cretaceous period through volcanic eruptions in western, central, and southern India. The eruptions resulted in enormous lava flows that covered over 1.5 million square kilometers. The lava cooled to form thick basalt deposits in some places over 3000 meters thick. The Deccan Traps are classified into upper, middle, and lower sections. They overlie various older rock formations and contain intertrappean beds. The volcanic rocks mainly consist of basalt and have economic uses as building material and as a source of minerals.