Formation	Age	Lithology	Thickness M	Depth M
Soil and alluvial deposits and Dibdiba fm	Pleistocene	friable sand gravel, Sand, feldspar and marl	93.5	93.5
Soil and alluvial deposits and Dibdiba fm	U. Miocene	friable sand gravel, Sand, feldspar and marl	93.5	93.5
Fatha	M. Miocene	Gypsum, silty gypsum, lime clay and limestone	106.4	197
Euphrates	L. Miocene	Fine grains limestone with lime clay	43.6	303.4
Dammam	U. Eocene	Fine grains of dolomitic limestone and lime clay at lower part	189.9	374
Rus	L. Eocene	Limestone with fine grains of anhydrite and dolomite	73.6	536.9
Al-Alegy	L. Eocene Paleocene	Lime clay, limestone and dolomite	271.9	610.5
Shiranish	U. Cretaceous	Lime clay containing a cutting of limestone	67.3	882.4