Three volcano-sedimentary sequences and related intrusive suites, ranging in age from pre-700 Ma to about 570 Ma, are recorded in the Midyan region of northwestern Saudi Arabia. Crustal history involved island-arc accretion and compressional tectonics up to about 625 Ma and extensional tectonics and rifting after that date. Possible correlatives of the Midyan stratigraphy, as well as ophiolitic rocks of a probable suture zone, may exist in southeastern Sinai, although doubt exists because of the conflicting views of workers in that area.

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