21. The classic Murray 1966 paper describes the generalized sequence as sediments-calcite-gypsum-anhydrite -salt. 22. Shales, anhydrite , halite and reefal limestones of the uppermost middle Miocene Belayim lie unconformably on the Kareem. 23. On heating above 250 �C, the completely anhydrous form called ?-anhydrite or dead burned plaster is formed. 24. This is a transformation of the mineral anhydrite ( anhydrous calcium sulphate ) into gypsum ( hydrous calcium sulphate ). 25. The overlying Lower Anhydrite Member consists of microcrystalline anhydrite with minor beds of fine-to medium-crystalline dolostone. 26. The overlying Lower Anhydrite Member consists of microcrystalline anhydrite with minor beds of fine-to medium-crystalline dolostone. 27. In 1980 the Lower Saxon State Office of Soil Science drilled 145 metres into the karst cavities below the anhydrite . 28. The tunnel runs in layers of Gipskeuper rock, containing anhydrite , which swell strongly when in contact with water. 29. The top of the salt mass is about below the surface and above it are limestone, gypsum, and anhydrite . 30. On heating above 250 �C, the completely anhydrous form called ?-anhydrite or " natural " anhydrite is formed.
