#geologist__geophysicist  a specialist in geology
  supertype:  scientist__man_of_science  a person with advanced knowledge of one of more sciences
  instance:  Arthur_Holmes  James_Hutton  Gideon_Algernon_Mantell  Henry_Rowe_Schoolcraft  Alfred_Lothar_Wegener  John_Tuzo_Wilson
  subtype:  petroleum_geologist__petroleumgeologist__oil_geologist__oilgeologist  a specialist in petroleum geology

No statement uses or specializes geologist; click here to add one.