#boulder__bowlder  a large smooth mass of rock detached from its place of origin
  supertype:  #rock.natural_object__stone  a lump of hard consolidated mineral matter; "he threw a rock at me"
  instance:  #Plymouth_Rock.boulder
  subtype:  #glacial_boulder__glacialboulder  a boulder that has been carried by a glacier to a place far distant from its place of origin
  subtype:  #river_boulder__riverboulder  a boulder that has been carried by a river to a place remote from its place of origin
  subtype:  #shore_boulder__shoreboulder  a boulder found on a shore remote from its place of origin

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