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Detailed Studies

January 01, 1996


Middle Miocene coral-oyster patch reefs crop out at Murchas, south of the city of Granada in southern Spain. They are irregularly shaped masses of coral-oyster boundstone, up to 18m wide and 3-4 m high, that developed on the outer part of a homoclinal ramp, seaward of some sand shoals, in a mixed carbonate-terrigenous enviroment. In these patch reefs, oysters and hermatypic corals are the main frame-builders, their association being entirely fortuitous. Heliastrea is the predominant coral. Porites, Tarbellastraea and the phaceloid coral Mussismilia are also important components. These corals show no clear pattern in their distribution and appear embedded in a silty (bioclastic) matrix. Oysters in the reef community belong to the species Hyotissa squarrosa. They grew vertically one upon another, anchored directly to coral skeletons or, more commonly, attached to other oysters. Hyotissa is irregularly distributed but in places accounts for up to 70% of the reef. Encrusting organisms are restricted to sediments between individual coral colonies or between reefs.

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Figures & Tables


SEPM Concepts in Sedimentology and Paleontology

Models for Carbonate Stratigraphy from Miocene Reef Complexes of Mediterranean Regions

Evan K. Franseen
Evan K. Franseen
Kansas Geological Survey, University of Kansas, Lawrence, Kansas
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Mateu Esteban
Mateu Esteban
Carbonates International Ltd, Esporles, Mallorca, Spain
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William C. Ward
William C. Ward
Department of Geology and Geophysics, University of New Orleans, Louisiana
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Jean-Marie Rouchy
Jean-Marie Rouchy
Laboratoire de Geologie, Museum National D'Histoire Naturelle, Paris, France
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SEPM Society for Sedimentary Geology
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Publication date:
January 01, 1996




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