• Petroduric and "petrosepiolitic" horizons in soils of Namaqualand, South Africa 

      Francis, Michele Louise; Fey, Martin V.; Ellis, Freddie; Poch, Rosa Maria (Universia, 2012)
      Indurated, light-coloured 'sepiocrete' horizons have been found in Namaqualand Calcisols and Durisols. These horizons resembled calcrete but were non- to only mildly calcareous, resisted slaking in acid and alkali, and ...