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New contributions to the Upper Senonian stratigraphy in Northern Iraq

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Zusammenfassung

Die Sedimente des oberen Senon sind im nördlichen Irak gut ausgebildet und repräsentieren drei Faziestypen: klastische Fazies, Riff-Fazies und Fazies des offenen Meeres. Sie werden stratigraphisch zugeordnet aufgrund von Ähnlichkeiten im Alter und in der Lithologie. Es wird eine neue Gliederung vorgeschlagen in: Ruwanduz-Riff-Gruppe mit Aqra-Limestone-, Bekhme-Limestone- und Pilsener Limestone-Formation und ferner Zakho-Mergel-Gruppe mit Shiranish-, Digma- und Jib'ab-Formation.

Die Autoren nehmen an, daß die Jib'ab-Formation ein Ausläufer der Shiranish-Formation ist; sie sollte deshalb nicht als getrennte lithostratigraphische Einheit behandelt werden.

Abstract

The Upper Senonian sediments are well developed in Northern Iraq and represent three types of facies; elastics, reefal, and open-marine. These sediments are classified stratigraphically depending upon similarities in age and lithology. New groups are proposed for the first time; Ruwanduz Reefal Group comprising Aqra Limestone Formation, Bekhme Limestone Formation and Pilsener Limestone Formation, and Zakho Marl Group including Shiranish Formation, Digma Formation and Jib'ab Formation.

It is suggested here that Jib'ab Formation is an extension of the Shiranish Formation and should not be treated as a separate lithostratigraphic unit.

Résumé

Les sédiments du Sénonien Supérieur sont bien dévéloppés dans le Nord de l'Irak et présentent trois types de faciès: élastique, corallien et marin de mer ouverte. Ces sédiments sont classés stratigraphiquement sur la base de similarités d'âge et de lithologie.

De nouveaux groupes sont proposés pour la première fois; le groupe corallien de Ruwanduz qui comprend la Formation du Calcaire d'Aqra, la Formation du Calcaire de Bekhme et la Formation du Calcaire de Pilsener, et le groupe des Marnes de Zakho qui comprend la Formation de Shiranish, la Formation de Digma et la Formation de Jib'ab.

Nous suggérons ici que la Formation de Jib'ab soit une extension de la Formation de Shiranish; elle ne devrait pas être traitée comme une unité lithostratigraphique séparée.

Краткое содержание

Осадочные породы вер хнего Сенона в северн ой части Ирака хорошо выражен ы и предствалены тремя типами: а) кластически й фаций, б) фаций рифов и в) фаций открыт ого моря. Их подраздел или стратиграфически по возрасту и литологии. Предлагается иное подразделение: групп а рифов Ruwanduz c формациями известн яков Aqra, известняков Bekhme и известняков Pilsener и также группа мерге лей Zakho с формациями Shiranisch, Digma и Jib'ab.

Авторы предполагают, что формация Jib'ab являет ся последышем формации Shiranisch; следовательно, ее не льзя рассматривать, к ак самостоятельную литостратиграфичес к

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Author notes

  1. Farouk S. Al-Omari ph. D. & Ali Sadek ph. D.

    Present address: Geology Department, College of Science, Mosul University, Iraq

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    1. Farouk S. Al-Omari ph. D.
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    2. Ali Sadek ph. D.
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    Al-Omari, F.S., Sadek, A. New contributions to the Upper Senonian stratigraphy in Northern Iraq. Geol Rundsch 63, 1217–1231 (1974). https://doi.org/10.1007/BF01821330

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