Endo- (from Greek endon, inside): the horizon or layer starts ≥ 50 cm from
the (mineral) soil surface; and no such horizon or layer occurs < 50 cm of
the (mineral) soil surface. (Examples: Endocalcic: the calcic horizon starts
≥ 50 and ≤ 100 cm from the soil surface; Endospodic: the spodic horizon
starts ≥ 50 and ≤ 200 cm from the mineral soil surface.)