#arenaceous_rock  a sedimentary rock composed of sand
  supertype:  #sedimentary_rock__sedimentaryrock  rock formed from consolidated clay sediments
  subtype:  #sandstone  a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
     subtype:  #firestone  a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns
     subtype:  #holystone  a soft sandstone used for scrubbing the decks of a ship
     subtype:  #gritrock__grit__gritstone  a hard coarse-grained siliceous sandstone
     subtype:  #brownstone.sandstone  a reddish brown sandstone; used in buildings
     subtype:  #bluestone  bluish-gray sandstone used for paving and building
     subtype:  #greensand  an olive-green sandstone containing glauconite
     subtype:  #siltstone  a fine-grained sandstone of consolidated silt

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