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  2. Volume 18, Issue 2
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ISSN: 1682-3222

Volume18, Issue2

Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq

    Inas H. Al-Khafaf Majid M. Al- Mutwali

Iraqi National Journal of Earth Sciences, 2018, Volume 18, Issue 2, Pages 35-60

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Abstract

The present work is a part of detailed study of biostratigraphy of Balambo Formation (Lower - Upper Cretaceous) from Azmer anticline - northeastern Iraq. Lithologically, the upper part of the studied section (Balambo Formation) consists of dark gray, reddish brown shale and marl intercalation with amonitic and marly limestone. Based on planktonic foraminifera, the studied section is divided into five main biozones and two subzones. It is correlated with collection of global regional and local previous biozones. These biozones led to conclude that the age of the upper part of Balambo Formation extends over the Latest Aptian to Middle-Late Cenomanian. Moreover, the identified biozones are from older (at bottom) to younger (at top):
5- Rotalipora cushmani Taxon range Zone.
4- Thalmanninella globotruncanoides Interval Zone.
3- Biticinella breggiensis Interval Zon.
Ticinella praeticinensis Interval Subzone.
Pseudothalmanninella subticinensis Interval Subzone.
2- Ticinella primula Interval Zone.
1- Paraticinella eubejaouensis Taxon range Zone.يتضمن البحث الحالي د ا رسة طباقية حياتية لمفو ا رمنيف ا ر الطافية لتكوين بالامبو
)الكريتاسي الأسفل الأعمى( في طية أزمر شمال شرقي الع ا رق. يتألف ىذا الجزء من تتابعات لطبقات - -
الطفل الرصاصي الغامق المون والطفل البني المحمر وطبقات من المارل متداخمة مع طبقات الحجر الجيري
الامونايتي وطبقات الحجر الجيري المارلي. تم تقسيم ىذا المقطع الطباقي الى خمسة أنطقة حياتية رئيسة
واثنين من الأنطقة الحياتية الثانوية. وتمت مضاىاة ىذه الأنطقة مع مجموعة من الأنطقة الطباقية الحياتية
العالمية والإقميمية والمحمية، وبيذا إتضح أن عمر ىذا الجزء من التكوين يمتد من أواخر الأبتيان المتأخر
الى السينومينيان الأوسط المتأخر. وىذه الأنطقة من الأقدم )في الأسفل( الى الأحدث )في الأعمى(: -
5- Rotalipora cushmani Taxon range Zone.
4- Thalmanninella globotruncanoides Interval Zone.
3- Biticinella breggiensis Interval Zone.
. Ticinella praeticinensis Interval Subzone.
Pseudothalmanninella subticinensis Interval Subzone.
2- Ticinella primula Interval Zone.
1-Paraticinella eubejaouensis Taxon range Zone.
Keywords:
    Biostratigraphy Planktonic Foraminifera Balambo Formation Northeastern
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(2018). Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq. Iraqi National Journal of Earth Sciences, 18(2), 35-60.
Inas H. Al-Khafaf ; Majid M. Al- Mutwali . "Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq". Iraqi National Journal of Earth Sciences, 18, 2, 2018, 35-60.
(2018). 'Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq', Iraqi National Journal of Earth Sciences, 18(2), pp. 35-60.
Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq. Iraqi National Journal of Earth Sciences, 2018; 18(2): 35-60.
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Journal Information

Publisher: Mosul University

Email:  iraqijournal@yahoo.com

Editor-in-chief: Professor Dr. Farouk Sinallah Al-Omari

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