Foraminiferal Zonation of the Cretaceous off Zaire and Cabinda, West Africa and Its Geological Significance
Published:January 01, 1982
George A. Seiglie, Mary B. Baker, 1982. "Foraminiferal Zonation of the Cretaceous off Zaire and Cabinda, West Africa and Its Geological Significance", Studies in Continental Margin Geology, J. S. Watkins, C. L. Drake
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We describe twelve foraminiferal zones of the Cretaceous continental margin of Zaire and Cabinda (Angola). These zones correspond as follows: one to the late Albian; four to the Cenomanian (one lateral facies); two to the Turonian; one to the Coniacian; one to the Santonian; two to the Campanian; and one to the Maestrichtian. The foraminiferal fauna indicate a transgression from the late Albian to middle Campanian interrupted by three short regressions at the end of the middle Cenomanian, late Turonian, and late Santonian. A regression began from middle Campanian to late Maestrichtian. The paleobathymetric curve of Cabinda (Angola) and Zaire corresponds to sea level changes in the eastern Arabian peninsula and southern England, but differ somewhat from the curve of Vail et a1 (1977).
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Studies in Continental Margin Geology
"Studies in Continental Margin Geology" contains papers from a research conference co-sponsored by AAPG and the University of Texas Institute for Geophysics held in Galveston, Texas in 1981. Rapid advances in the understanding of continental margin geology were taking place during the time period, based on major improvements in the quality and availability of regional seismic surveys plus other fields such as organic geochemistry. For the first time it was becoming common to have a visual characterization of tectonic processes at significant depths below the surface. Twenty-seven papers are presented that deal with field investigations of continental margin structure and stratigraphy. The geographic areas of study are global in nature and many of the descriptive results are derived from modern seismic investigations in areas where that type of data had not previously been available in commercial publications. Fifteen of the papers focus on rifted margins and the other twelve concern convergent margins. Twelve papers are model investigations of a variety of margin environmental processes, related to subjects such as depositional environments, biostratigraphy, organic matter deposition, and oil and gas occurrences as a function of the plate tectonic setting. An additional nine papers model the thermal and mechanical tectonic processes involved in the structural development along continental margins.