Trapp (geology)

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Dekkan-Trapp near Pune

Trapp is the old Scandinavian (Swedish trappa for "stair") name for stair-like formations made of flood basalt (or other igneous rocks , such as diabase or melaphyre ), which sometimes extend over vast areas. These are numerous superimposed cover-like formations, which are often separated from one another by terrestrial sediments.

Trap ceilings are created by the solidification of thin- flowing lava that emerges from the underground through deep crevices lying next to one another. The resulting more or less flat areas of spread of the cooled lava are known as lava plateaus, trapezoidal ceilings, plateau basalt or flood basalt, which can sometimes be several thousand meters thick .

Well-known examples are the Dekkan Trapp in India, the Siberian Trapp in Russia, the Emeishan Trapp in southern China, and the Columbia plateau basalt in the northwestern United States.

See also


Individual evidence

  1. Trapp in the Universal Lexicon at, accessed on May 5, 2017.
  2. Lexicon of Geography - Trapp , accessed on November 25, 2017