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The present work deals with a detailed chemical study on the clay mineral assemblages characterizing some clay deposits, shales and mudstones, which differ in their texture, colour, lithology, and depositional environments. Samples selected from seven Tertiary formations located in Makkah and Rabigh quadrangles are chemically analyzed; some are used as environmental discriminators. The distribution of major and some trace elements in 77 samples has been investigated and the results obtaineddoi:10.4197/ear.15-1.4 fatcat:phplk5afondyte7nu4jng2heke