#soil_horizon  a layer in a soil profile
  supertype:  #horizon  a specific layer or stratum of soil or subsoil in a vertical cross section of land
  subtype:  #A-horizon  #B-horizon  #C-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 #soil_horizon; click here to add one.