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Table 1 The members of the Zubair Formation in Southern Iraq after (Al-jabry and Al-jafar 2020)

From: Determination of clay minerals using gamma ray spectroscopy for the Zubair Formation in Southern Iraq

Formation Member Average thickness (m) Lithology
ZUBAIR Upper Shale Member Z/1 85–95 Shale with two units of sandstone contains the secondary amount of shale
Upper Sandstone Member (USS) Z/2 95–110 Sandstone with few amounts of shale
Middle Shale Member Z/4 65–75 Black Shale with few amounts of sandstone
Lower Sandstone Member Z/5 50–60 Fine to very fine sandstone with few amounts of shale
Lower Shale Member Z/6 60–70 Fissile, grey to black shale, with a zone of sandstone