Trap rock, also known as either trapp or trap, is any dark-colored, fine-grained, nongranitic intrusive or extrusive igneous rock. Types of trap rock include basalt, peridotite, diabase, and fine-grained gabbro. Trapp (trap) is also used to refer to flood (plateau) basalts, i.e. the Deccan traps and Siberian traps. The erosion of trap rock created...
Found on
http://en.wikipedia.org/wiki/Trap_rock
Rock formed from solidified lava, which usually contains pockets holding crystals.
Found on
http://www.encyclo.co.uk/local/22291
term sometimes applied to basalt and even to dolerite (=fine grained gabbro
Found on
https://www.encyclo.co.uk/local/20132
No exact match found.
