#sedimentary_rock__sedimentaryrock  rock formed from consolidated clay sediments
  supertype:  rock__stone  material consisting of the aggregate of minerals like those making up the Earth's crust
  subtype:  argillite  a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
  subtype:  arenaceous_rock  a sedimentary rock composed of sand
     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
  subtype:  argillaceous_rock  a sedimentary rock formed from clay deposits
  subtype:  rudaceous_rock__rudaceousrock  a sedimentary rock formed of coarse-grained material
     subtype:  breccia  a rudaceous rock consisting of sharp fragments embedded in clay or sand
  subtype:  slate.sedimentary_rock  a fine-grained metamorphic rock that can be split into thin layers
  subtype:  limestone  a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
  subtype:  shale  a sedimentary rock formed by the deposition of successive layers of clay
     subtype:  oil_shale__oilshale  shale from which oil can be obtained by heating

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