Trap rock Wikipedia
Trap rock, also known as either trapp or trap, is any darkcolored, finegrained, nongranitic intrusive or extrusive igneous of trap rock include basalt, peridotite, diabase, and gabbro. Trapp (trap) is also used to refer to flood (plateau) basalts, the Deccan Traps and Siberian Traps. The erosion of trap rock created by the stacking of successive lava flows often created a ...