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Upper Vis ÉAn Saccamminopsis-Sponge Microbial Mud Mounds, Sierra De La Estrella, Southwestern Spain

By
Marta RodrÍGuez-MartÍNez
Marta RodrÍGuez-MartÍNez
Departamento De EstratigrafíA, Facultad De Ciencias GeolóGicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain, e-mail: martarm@geo.ucm.es
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Pedro CÓZar
Pedro CÓZar
Departamento De Paleontología, Facultad De Ciencias GeolóGicas, Universidad Complutense De Madrid, Ciudad Universitaria S/N, 28040-Madrid, Spain, e-mail: pcozar@Geo.Ucm.Es
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Ramon Mas
Ramon Mas
Departamento De Estratigrafí>A, Facultad De Ciencias GeolóGicas, Universidad Complutense De Madrid, Ciudad Universitaria S/N, 28040-Madrid, Spain, e-mail: ramonmas@geo.ucm.es
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Sergio Rodriguez
Sergio Rodriguez
Departamento De Paleontología, Facultad De Ciencias Geológicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain, e-mail: sergrod@geo.ucm.es
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Published:
January 01, 2003

Abstract

Dome-shaped mud mounds ranging in size from 2 m to 25 m thick and from 2 m to 100 m in diameter are present in the Upper Viséan of Sierra de la Estrella, Guadiato Valley, in the Sierra Morena region of SW Iberian Peninsula. The mounds are composed of up to 70% peloidal matrix and contain a varied but sparse assemblage including bryozoans, crinoids, brachiopods, calcareous algae, foraminifers, and gastropods. A three-stage biotic succession is recognizable in the mounds. The first stage consists of crinoid-sponge spicule packstones. The second stage is represented by a low-diversity, autochthonous assemblage of scattered sponges and up to 40-60% by volume of the microproblematical taxon Saccamminopsis fusulinaeformis (McCoy). The third stage consists of peloidal framework and cementstone with abundant primary growth cavities. These rocks are interpreted to be microbial boundstone-cementstone. The three stages of mound growth developed below storm wave base, and the probable coeval, level-bottom beds consisting of marls are interpreted to have been deposited in a dysphotic environment.

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SEPM Special Publication

Permo-Carboniferous Carbonate Platforms and Reefs

Wayne M. Ahr
Wayne M. Ahr
Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843-3115, U.S.A.
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Paul M. (Mitch) Harris
Paul M. (Mitch) Harris
ChevronTexaco E&P Technology Company, 6001 Bollinger Canyon Road, San Ramon, California 94583-0746, U.S.A.
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William A. Morgan
William A. Morgan
ConocoPhillips, Inc., P.O. Box 2197, Houston, Texas 77252-2197, U.S.A.
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Ian D. Somerville
Ian D. Somerville
Department of Geology, University College - Dublin, Belfield, Dublin 4, Ireland
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SEPM Society for Sedimentary Geology
Volume
78
ISBN electronic:
9781565763340
Publication date:
January 01, 2003

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