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trappean

adjective
  1. rare of, relating to, or consisting of igneous rock, esp a basalt
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Word Origin for trappean

C19: from trap ³
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for trappean

Historical Examples of trappean

  • Such masses are termed trappean agglomerate and trappean breccia.

    Geology

    James Geikie

  • We first crossed more hills of the trappean conglomerate on which grew ironbark eucalypti and box.

  • We this day crossed several fine running streams and forests of box and bluegum growing on ridges of trappean conglomerate.

  • What is the difference between trappean breccia and trappean conglomerate?

    Geology

    James Geikie

  • They never repose on the volcanic or trappean formations, nor on strata containing organic remains.