Abstract
Tanjero Formation is an Upper Cretaceous (Campanian-Maastrichtian) unit, which crops out within the Imbricated and High Folded Zones in Northeastern Iraq. Its outcrop stretches as narrow northwest-southeast belt near and parallel to the Iranian border. The formation mainly consists of alternation of clastic rocks of sandstone, marl and calcareous shale with occurrence of very thick conglomerate and biogenic limestones. In this study many sedimentary structures are found in the Tanjero Formation, which have paleocurrent importance. These structures are cross bedding interference ripple marks, imbricated pebbles, elongate rudist and belemnite, plant debris, sole marks, valleys and channels. Most of these structures are found in the lower part. The paleocurrent analyses, as revealed by these structures, are presented in rose and stereonet diagrams, which show south and southwest directions. ــــــــــــــــ
Highlights
Tanjero Formation is an Upper Cretaceous (Campanian-Maastrichtian) unit, which crops out within the Imbricated and High Folded Zones in Northeastern Iraq
The formation mainly consists of clastic sediments, which includes sandstone, marl and calcareous shale with occurrence of very thick conglomerate and biogenic limestones (Bellen et al, 1959)
The variables used for indication of the paleocurrent direction are as follows: Type of sedimentary rocks: From the facies distribution map of Upper Cretaceous can be realizes that the reefal limestones (Aqra-Bekhme Formation) are mainly located at northwest of the main basin of Tanjero and Shiranish Formations
Summary
Tanjero Formation is an Upper Cretaceous (Campanian-Maastrichtian) unit, which crops out within the Imbricated and High Folded Zones in Northeastern Iraq. الملخص ماستريختيان( وتقع-ان تكوين تانجيرو عبارة عن وحدة صخرية تعود إلى الكريتاسي الأعلى )كامبانيان تمتد مكاشفه كنطاق ضيق باتجاه شمال.مكاشفه ضمن نطاق التراكب والطيات العالية في شمال شرق العراق يتكون التكوين بصورة رئيسية من تعاقب الصخور الفتاتية.غرب–جنوب شرق على امتداد الحدود الايرانية الرملية والغرينية والمارل )أو الطفل الجيري( ويتغير إلى سمك كبير من المدملكات و الحجر الجيري الحياتي تم أيجاد كثير من التراكيب الرسوبية في الجزء السفلي للتكوين وهذه.في المنطقة القريبة من المصدر التراكيب ذات اهمية كبيرة في تحديد اتجاه التيار القديم ومن بينها والطبقات المتقاطعة وعلامات النيم العرضية والمتداخلة والمتحجرات الطويلة والحصوات المتراكبة وتراكيب السطوح السفلية والركام النباتي The variables used for indication of the paleocurrent direction are as follows: Type of sedimentary rocks: From the facies distribution map of Upper Cretaceous can be realizes that the reefal limestones (Aqra-Bekhme Formation) are mainly located at northwest of the main basin of Tanjero and Shiranish Formations.
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