#horizon  a specific layer or stratum of soil or subsoil in a vertical cross section of land
  supertype:  stratum  one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism)
  subtype:  soil_horizon  geological_horizon
  part of:  profile.cross_section  a vertical section of the Earth's crust showing the different horizons or layers

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