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Paleoecology of Late Cretaceous Rudist Settlements in Central Oman

By
Dietrich Schumann
Dietrich Schumann
Geologisch–Palaontologisches Institut, Technische Universitat Darmstadt, Schnittspahnstr. 9, D–64287 Darmstadt, Germany.
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Published:
January 01, 2000

Abstract

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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SEPM Special Publication

Middle East Models of Jurassic/Cretaceous Carbonate Systems

Abdulrahman S. Alsharhan
Abdulrahman S. Alsharhan
Faculty of Science United Arab Emirates University, P.O. Box 17551, Al Ain, U.A.E.
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;
Robert W. Scott
Robert W. Scott
Precision Stratigraphy Associates, RR3 Box 103-3, Cleveland, OK 74020, U.S.A.
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SEPM Society for Sedimentary Geology
Volume
69
ISBN electronic:
9781565761919
Publication date:
January 01, 2000

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