TRAPROCK

Trap rock

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 is also used to refer to flood basalts, i.e. the Deccan traps and Siberian traps. The erosion of trap rock created by the stacking of successive lava flows often created a distinct stair-step landscape from which the term "trap" was derived from the Scandinavian word "trappa", which means "stair step".

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trap rock

Noun

  1. A form of igneous rock that tends to form polygonal vertical fractures.


The above text is a snippet from Wiktionary: trap rock
and as such is available under the Creative Commons Attribution/Share-Alike License.

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