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Micropaleontological and sedimentological data of the Lower to mid-Cretaceous sequence in the Western High Atlas of Morocco support the existence of a deltoid/triangular Atlas-Gulf. Transgressions and regressions in the Gulf area documented by the micropaleontological record include significant transgressive events during the Berriasian to Valanginian, early Barremian, late Aptian, and Turanian, and regressions in the late Hauterivian and late Barremian to early Aptian. Frequent sea-level oscillations are recorded in the Cenomanian. Continental, lagoonal, littoral, and inner to mid-shelf conditions are deduced from micropaleontological and sedimentological data. Intertonging of marine and nonmarine paleoenvironmental conditions exhibits transitional characteristics between the Atlantic province and the inner part of the Gulf. Assuming a steady subsidence of the Gulf area because of its location in the mobile High Atlas belt, eustatic changes in sea level may be the most important factor controlling sedimentation, paleoenvironment, and paleobathymetry in the Atlas-Gulf.

Micropaleontological and Sedimentological Aspects of High Atlas Cretaceous Onshore Sediments (Atlas-Gulf, Morocco)