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Middle Eocene-Early Miocene larger foraminifera from Dhofar (Oman) and Socotra Island (Yemen)
by Garcia Alejandro Gallardo
Institution: | Universitat de Barcelona |
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Year: | 2015 |
Keywords: | Estratigrafia; Estratigrafía; Stratigraphic geology; Foraminífers; Foraminíferos; Foraminifera; Oman; Omán; Socotra; Ciències Experimentals i Matemàtiques |
Posted: | 02/05/2017 |
Record ID: | 2118721 |
Full text PDF: | http://hdl.handle.net/10803/336096 |
Here, the larger foraminifera found in Middle Eocene-Early Miocene rocks from Dhofar (Oman) and Socotra Island (Yemen) are studied in detail. The architectural analysis leads to the description of four new genera and nine new species: five agglutinated foraminifera, Pseudolituonella roberti n. sp., Socotraella ashawqi n. gen. n. sp., Pseudochrysalidina ayaki n. sp., Barattolites andhuri n. sp. and Dhofarella aydimi n. gen. n. sp.; and four porcellaneous foraminifera, Idalina grelaudae n. sp., Idalina pignattii n. sp., Macetadiscus incolumnatus n. gen. n. sp. and Omanodiscus tenuissimus n. gen. n. sp. The larger foraminifera identified in a Composite section located in Western Dhofar, in the Shuwaymiyah section located in Eastern Dhofar and in the Wadi Ayak section located on Socotra Island, has facilitated the identification of the following larger foraminifera zones: SBZ 14-SBZ 15 (Middle Lutetian), SBZ 16 (Late Lutetian), SBZ 17 (Bartonian), SBZ 18 (latest Bartonian-earliest Priabonian), SBZ 19-SBZ 20 (Priabonian), SB 21-SB 22A (Rupelian), SB 22B-SB 23 (Chattian) and SB 24 (Aquitanian). All these data permit stablished the age of the following lithostratigraphic units: Dammam Fm. Andhur Mb Early Lutetian?-Middle Lutetian age (SBZ 13?-SBZ 14 partim), Qara Mb Middle Lutetian (SBZ 14-SBZ 15), Uyun Mb Late Lutetian (SBZ 16). Aydim Fm. Heiron Mb Bartonian (SBZ 17), Moosak Mb upper Bartonian-Priabonian (SBZ 18-SBZ 20), Tagut Mb Priabonian (SBZ 19-SBZ 20), Haluf Mb Priabonian (SBZ 19-SBZ 20) till SBZ 21 on Socotra Island. Ashawq Fm Rupelian (SB 21-SB 22A). Mughsayl Fm Chattian-Aquitanian (SB 23-SB 24).; En esta tesis se han estudiado en profundidad los macroforaminíferos encontrados en rocas del Eoceno Medio al Mioceno Inferior de la región del Dhofar (Sultanato de Omán) y de la isla de Socotra (Yemen). Su análisis arquitectural permite la descripción de cuatro géneros nuevos así como de nueve nuevas especies; cinco de macroforaminíferos aglutinados, Pseudolituonella roberti n. sp., Socotraella ashawqi n. gen. n. sp., Pseudochrysalidina ayaki n. sp., Barattolites andhuri n. sp. y Dhofarella aydimi n. gen. n. sp.; y cuatro de macroforaminíferos aporcelanados, Idalina grelaudae n. sp., Idalina pignattii n. sp., Macetadiscus incolumnatus n. gen. n. sp. y Omanodiscus tenuissimus n. gen. n. sp. Los macroforaminíferos identificados en la sección Compuesta, situada en el Dhofar Occidental; en la sección de Shuwaymiyah, situada en el Dhofar Oriental y en la sección de Wadi Ayak, localizada en la isla de Socotra, han facilitado la identificación de las siguientes biozonas de macroforaminíferos: SBZ 14-SBZ 15 (Luteciense Medio), SBZ 16 (Luteciense Superior), SBZ 17 (Bartoniense), SBZ 18 (Bartoniense Superior-Priaboniense Inferior), SBZ 19-SBZ 20 (Priaboniense), SB 21-SB 22A (Rupeliense), SB 22B-SB 23 (Catiense) and SB 24 (Aquitaniense). Todos estos datos permiten establecer la edad de las siguientes unidades litoestratigráficas; Formación Dammam: Miembro Andhur Mb Luteciense Inferior?-Luteciense Medio (SBZ 13? -SBZ 14…
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