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Planktonic Foraminiferal Biostratigraphy of the Upper part of Balambo Formation (Lower-Upper Cretaceous) in Azmer Anticline, Northeastern Iraq | ||
| Iraqi National Journal of Earth Science (INJES) | ||
| Article 5, Volume 18, Issue 2, 2018, Pages 35-60 PDF (0 K) | ||
| DOI: 10.33899/earth.2018.159257 | ||
| Authors | ||
| Inas Al-Khafaf; Majid Al- Mutwali | ||
| 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.یتضمن البحث الحالی د ا رسة طباقیة حیاتیة لمفو ا رمنیف ا ر الطافیة لتکوین بالامبو )الکریتاسی الأسفل الأعمى( فی طیة أزمر شمال شرقی الع ا رق. یتألف ىذا الجزء من تتابعات لطبقات - - الطفل الرصاصی الغامق المون والطفل البنی المحمر وطبقات من المارل متداخمة مع طبقات الحجر الجیری الامونایتی وطبقات الحجر الجیری المارلی. تم تقسیم ىذا المقطع الطباقی الى خمسة أنطقة حیاتیة رئیسة واثنین من الأنطقة الحیاتیة الثانویة. وتمت مضاىاة ىذه الأنطقة مع مجموعة من الأنطقة الطباقیة الحیاتیة العالمیة والإقمیمیة والمحمیة، وبیذا إتضح أن عمر ىذا الجزء من التکوین یمتد من أواخر الأبتیان المتأخر الى السینومینیان الأوسط المتأخر. وىذه الأنطقة من الأقدم )فی الأسفل( الى الأحدث )فی 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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