Los macroforaminíferos del Eoceno Medio del borde suroriental de la Cuenca paleógena surpirenaica
Abstract (Summary)On the eastern margin of the South Pyrenean basin, the late Middle Eocene marine sediments are represented by two successive sedimentary cycles, Collbàs and Igualada. The sedimentation in both cycles was dominated by terrigenous influx and only sporadically carbonate sedimentation took place. Ten paleoenvironmental assemblages of foraminifera have been individualised within these sediments that characterise open marine shelf, reef, lagoonal and litoral facies. In terms of the Shallow Benthic Zonation (SBZ), larger Foraminifera occurring within the Collbàs and Igualada cycles belong to the SBZ-17 and SBZ-18 (late Middle Eocene), respectively. Accordingly, the Upper Eocene is not represented in this area by marine sediments as reflected by the absence of foraminifera from the SBZ-19. In the upper part of the SBZ-18 some genera and/or species typical from the Central Tethys occur; they are interpreted as immigrants from the Central Tetis, because no predecessors have been observed in the Mediterranean realm.
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Source Type:Master's Thesis
Keywords:405 departament de geologia
Date of Publication:12/13/2001