Gypsiferous marl is a soil type described by Tom Stevenson (2011) as ‘a marly soil permeated with Keuper or Muschelkalk gypsum fragments, which improve the soil’s heat-retention and water-circulation properties.’

Bibliography

Tom Stevenson (2011) The Sotheby’s Wine Encyclopedia 5th Edition by Tom Stevenson (Dorling Kindersley, 2011), p.17-19.