Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges
<p>The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages of planktonic foraminifera. We examined the biostratigraphy, stratigraphic range and preservation of upper Eocene planktonic foraminifera. Assemblages are well-preserved and diverse, with 40...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-09-01
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| Series: | Journal of Micropalaeontology |
| Online Access: | https://jm.copernicus.org/articles/40/145/2021/jm-40-145-2021.pdf |
| _version_ | 1830477977186467840 |
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| author | B. S. Wade M. H. Aljahdali Y. A. Mufrreh A. M. Memesh S. A. AlSoubhi I. S. Zalmout |
| author_facet | B. S. Wade M. H. Aljahdali Y. A. Mufrreh A. M. Memesh S. A. AlSoubhi I. S. Zalmout |
| author_sort | B. S. Wade |
| collection | DOAJ |
| description | <p>The Rashrashiyah Formation of the Sirhan Basin in northern Saudi
Arabia contains diverse assemblages of planktonic foraminifera. We examined
the biostratigraphy, stratigraphic range and preservation of upper Eocene
planktonic foraminifera. Assemblages are well-preserved and diverse, with
40 species and 11 genera. All samples are assigned to the Priabonian
<i>Globigerinatheka semiinvoluta</i> Highest Occurrence Zone (E14), consistent with calcareous nannofossil
biostratigraphy indicating Zone CNE17. Well-preserved planktonic
foraminifera assemblages from the lower part of the upper Eocene are rare
worldwide. Our study provides new insights into the stratigraphic ranges of
many species. We find older (Zone E14) stratigraphic occurrences of several
species of <i>Globoturborotalita</i> previously thought to have evolved in the latest Eocene (Zone
E15, E16) or Oligocene; these include <i>G. barbula, G. cancellata, G. gnaucki, G. pseudopraebulloides</i>, and <i>G. paracancellata</i>. Older stratigraphic
occurrences for <i>Dentoglobigerina taci</i> and <i>Subbotina projecta</i> are also found, and <i>Globigerinatheka kugleri</i> occurs at a younger stratigraphic
level than previously proposed. Our revisions to stratigraphic ranges
indicate that the late Eocene had a higher tropical–subtropical diversity of
planktonic foraminifera than hitherto reported.</p> |
| first_indexed | 2024-12-21T16:22:30Z |
| format | Article |
| id | doaj.art-887e7f9ecffa4b4f9676ad441ddeea72 |
| institution | Directory Open Access Journal |
| issn | 0262-821X 2041-4978 |
| language | English |
| last_indexed | 2024-12-21T16:22:30Z |
| publishDate | 2021-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Micropalaeontology |
| spelling | doaj.art-887e7f9ecffa4b4f9676ad441ddeea722022-12-21T18:57:32ZengCopernicus PublicationsJournal of Micropalaeontology0262-821X2041-49782021-09-014014516110.5194/jm-40-145-2021Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic rangesB. S. Wade0M. H. Aljahdali1Y. A. Mufrreh2A. M. Memesh3S. A. AlSoubhi4I. S. Zalmout5Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UKMarine Geology Department, Faculty of Marine Sciences, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi ArabiaSaudi Geological Survey, Department of Sedimentary Geology, Jeddah, Saudi ArabiaSaudi Geological Survey, Department of Paleontology, Jeddah, Saudi ArabiaSaudi Geological Survey, Department of Sedimentary Geology, Jeddah, Saudi ArabiaSaudi Geological Survey, Department of Sedimentary Geology, Jeddah, Saudi Arabia<p>The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages of planktonic foraminifera. We examined the biostratigraphy, stratigraphic range and preservation of upper Eocene planktonic foraminifera. Assemblages are well-preserved and diverse, with 40 species and 11 genera. All samples are assigned to the Priabonian <i>Globigerinatheka semiinvoluta</i> Highest Occurrence Zone (E14), consistent with calcareous nannofossil biostratigraphy indicating Zone CNE17. Well-preserved planktonic foraminifera assemblages from the lower part of the upper Eocene are rare worldwide. Our study provides new insights into the stratigraphic ranges of many species. We find older (Zone E14) stratigraphic occurrences of several species of <i>Globoturborotalita</i> previously thought to have evolved in the latest Eocene (Zone E15, E16) or Oligocene; these include <i>G. barbula, G. cancellata, G. gnaucki, G. pseudopraebulloides</i>, and <i>G. paracancellata</i>. Older stratigraphic occurrences for <i>Dentoglobigerina taci</i> and <i>Subbotina projecta</i> are also found, and <i>Globigerinatheka kugleri</i> occurs at a younger stratigraphic level than previously proposed. Our revisions to stratigraphic ranges indicate that the late Eocene had a higher tropical–subtropical diversity of planktonic foraminifera than hitherto reported.</p>https://jm.copernicus.org/articles/40/145/2021/jm-40-145-2021.pdf |
| spellingShingle | B. S. Wade M. H. Aljahdali Y. A. Mufrreh A. M. Memesh S. A. AlSoubhi I. S. Zalmout Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges Journal of Micropalaeontology |
| title | Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges |
| title_full | Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges |
| title_fullStr | Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges |
| title_full_unstemmed | Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges |
| title_short | Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges |
| title_sort | upper eocene planktonic foraminifera from northern saudi arabia implications for stratigraphic ranges |
| url | https://jm.copernicus.org/articles/40/145/2021/jm-40-145-2021.pdf |
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