Paleoecology of Late Cretaceous Rudist Settlements in Central Oman
Dietrich Schumann, 2000. "Paleoecology of Late Cretaceous Rudist Settlements in Central Oman", Middle East Models of Jurassic/Cretaceous Carbonate Systems, Abdulrahman S. Alsharhan, Robert W. Scott
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Rudist associations were normally destroyed during or shortly after their development. Consequently, exact paleobiological examinations are very difficult or impossible. The in–situ associations of Central Oman are often completely preserved and enable a precise paleobiological and paleoecological description to be made. They developed during a transgression onto the Arabian platform. Microfacies analysis based on extensive field observations reveal that vigorous turbulent conditions prevailed very frequently throughout the period. The development and preservation of in–situ rudist associations are rare. As a rule episodic turbulence prevented the development of such structures. In the same way, turbulence normally destroyed rudist associations. The model of constratal growth (Perkins 1974; Gili et al., 1995a; Skelton et al., 1995) is discussed, including the question whether thick, extensive rudist associations should be named reefs. The absence of vast rudist reefs is believed not to be a consequence of an inherent inability of vertically growing rudists to build such structures, but can be mainly attributed to exogenous, abiotic factors. The associations investigated here inhabited restrictive, shallow–marine environments. Rapid growth of a few rudist species is verified. Vertically growing rudist associations of 5–8 successive in–situ generations represent a period of only two to three hundred years.
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Middle East Models of Jurassic/Cretaceous Carbonate Systems
This volume will interest tectonic modelers, stratigraphers, sedimentologists, and explorationists. It is the product of the international conference of “Jurassic/Cretaceous Carbonate Platform-Basin Systems, Middle East Models” that was convened in December 1997 jointly by SEPM (Society for Sedimentary Geology) and the United Arab Emirates University in Al Ain, United Arab Emirates. The twenty-three papers present new data and interpretations arranged in three sections: 1) sequence stratigraphy, cyclostratigraphy, chronostratigraphy, and tectonic influences, 2) depositional and diagenetic models of carbonate platforms, and 3) hydrocarbon habitat and exploration/development case studies. New tectonic models of the Arabian Basin, new stratigraphic and sequence stratigraphic reference sections, new geochemical and source rock data, and new reservoir data are presented. New geologic models make this set of papers relevant to geoscientists working outside of Arabia also.