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Trap Rock: Dark igneous rocks used to make crushed stone

Trap rock is a construction industry term for dark-colored igneous rocks such ... in geographic areas where stacked basalt flows and shallow intrusions outcrop to...

Trap rock - Wikipedia

Trap rock, also known as either trapp or trap, is any dark-colored, fine-grained, non-granitic ... The erosion of trap rock created by the stacking of successive lava flows often created a distinct stairstep ... A major use for basalt is crushed rock for road and housing construction in concrete, macadam, and paving stones.