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Iraqi National Journal of Earth Science

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Geological history, Ichnofacies and Sequence Stratigraphy of the Eocene – Oligocene Boundary at Sinjar Area, Northwestern Iraq

    Majid Al-Mutwali Hiba Al-Rubai

Iraqi National Journal of Earth Science, 2021, Volume 21, Issue 1, Pages 27-45
10.33899/earth.2021.170380

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Abstract

Three outcrop sections for the Eocene- Oligocene boundary have been studied in Sinjar anticline northwestern Iraq. This study includes the lithostratigraphy, biostratigraphy and the identification of trace fossils and related ichnofacies in order to report the geological history of this boundary in the frame of sequence stratigraphy. Jaddala Formation, which is composed of marl and marly limestone, represents deep (outer shelf-upper bathyal) Eocene facies, Palani and Tarjil formations represent deposition in deep basinal environments during Early and Late Oligocene sequences.
    The Eocene- Oligocene boundary in Sinjar area represents a disconformity surface, where the deposition ceased in the Middle Eocene (Lutetian) at the end of Jaddala Formation, forming  the firmground  Glossifungites Ichnofacies which embrace  Thalassinoides ichnotaxa in Jaddala section, and the hardground  Trypanites Ichnofacies  in Sharafiddin section, while at Sinjar section, a chalky limestone bed deposited at the Early Oligocene (Rupelian) Palani Formation representing Skolithos Ichnofacies.
    A rapid wide transgression took place at the end of Early Oligocene (Rupelian) leading to the deposition of Palani Formation, and continued through the Late Oligocene (Chattian) leading to the deposition of Tarjil Formation.
Keywords:
    Sinjar Formations disconformity Oligocene Ichnofacies Biostratigraphy lithostratigraphy
Main Subjects:
  • Paleontology
  • Stratigraphy
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(2021). Geological history, Ichnofacies and Sequence Stratigraphy of the Eocene – Oligocene Boundary at Sinjar Area, Northwestern Iraq. Iraqi National Journal of Earth Science, 21(1), 27-45. doi: 10.33899/earth.2021.170380
Majid Al-Mutwali; Hiba Al-Rubai. "Geological history, Ichnofacies and Sequence Stratigraphy of the Eocene – Oligocene Boundary at Sinjar Area, Northwestern Iraq". Iraqi National Journal of Earth Science, 21, 1, 2021, 27-45. doi: 10.33899/earth.2021.170380
(2021). 'Geological history, Ichnofacies and Sequence Stratigraphy of the Eocene – Oligocene Boundary at Sinjar Area, Northwestern Iraq', Iraqi National Journal of Earth Science, 21(1), pp. 27-45. doi: 10.33899/earth.2021.170380
Geological history, Ichnofacies and Sequence Stratigraphy of the Eocene – Oligocene Boundary at Sinjar Area, Northwestern Iraq. Iraqi National Journal of Earth Science, 2021; 21(1): 27-45. doi: 10.33899/earth.2021.170380
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