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The basis of this Lexicon is the ‘Stratigraphy and Rock Unit Nomenclature in the Oil-Producing Area of Interior Oman’, published in 1988 by Mike Hughes Clarke combined with the ‘Catalogue of Oman Lithostratigraphy’, an internal Petroleum Development Oman (PDO) report compiled by Rashid Mohammed, Eva Reindl and John Hussey in 1997. In turn these were based on earlier compilations, notably Hoogkamer (1979), ‘Lithostratigraphic Lexicon of Oman’ and Bouwers (1967), ‘Rock-unit Lexicon of Oman’.

All chapters and illustrations in this Lexicon have been compiled, reviewed, written and edited by Gordon Forbes, Huub Jansen and Jan Schreurs (PDO). The authors wish to specifically acknowledge and thank the following colleagues and ex-colleagues for their contributions, advice and encouragement.

The Wasia Group and Kahmah Group chapters have drawn extensively from studies by Henk Droste (Shell, previously PDO) and Mia van Steenwinkel (previously PDO).

The Minjur Formation of the Akhdar Group is based on the work of Mia van Steenwinkel.

The Haushi Group has been reviewed by John Aitken (PDO), Randall Penney (PDO) and Alan Heward (Petrogas E&P).

John Aitken (PDO) reviewed and edited early versions of the Haima Supergroup chapters. These chapters also benefited from input and review by Frank Oprinsen (PDO) and from the biostratigraphic support of Graham Booth (PDO).

The Huqf Supergroup chapters were reviewed by Joachim Amthor and Zuwena Rawahi (both PDO). Joachim Amthor (PDO) reviewed and edited early versions of the Basement Group chapter. Irene Gomez-Perez (PDO) reviewed final versions of the Huqf Supergroup and Basement Group chapters.

John Grotzinger (California Institute of Technology) provided valuable comments on the final versions of the Ara Group and Nafun Group chapters.

The final text, layout and graphics design was done by Heather Pattison, GeoArabia’s Assistant Editor, who has done an excellent and painstaking job. Proof-reading and the editorial advice by GeoArabia’s Editor-in-Chief, Moujahed Al-Husseini, greatly benefited the book. GeoArabia’s Production Manager, Nestor A. Buhay II, is thanked for supervising the book in press.

Many geologists have contributed to the deciphering of the stratigraphy of Oman through more than 50 years of exploration and production. Through time the emphasis has shifted from the younger stratigraphy to older rocks, following the discovery and production of hydrocarbons in successively Mesozoic carbonates, Palaeozoic clastics and late Neoproterozoic to ‘Early’ Cambrian carbonates, spanning now an impressive 550 million years of geological time. Studies by various universities have contributed greatly to our understanding of the older rocks. Oman has now emerged as one of the few countries in the world with good data covering the very important late Neoproterozoic stratigraphy. It would be impossible to list all who have contributed through the years. The extensive list of references that has grown by almost a factor of 10 since 1997 is evidence of the significance of Oman rocks to the worldwide geological community.

This impressive publication record would not have been possible without the very strong support of the Oman Ministry of Oil and Gas and PDO management consistently encouraging and supporting the publication of Oman’s geological story as it has developed. Continuing this tradition the Ministry has also encouraged the publication of this new Lexicon in order to share subsurface knowledge outside PDO and to support the increasing levels of activity associated with the exploration and production of oil and gas in Oman.

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