Sedimentological Study and Age Determination of the Shiranish Formation in Perat Anticline, Northern Iraq
Abstract
A sedimentological and nannofossil biostratigraphical study of the Shiranish Formation focuses on an exposed section of the Perat anticline's northern limb. The formation consists of limestone, marl, and marly limestone. It produces a diverse range of calcareous nannofossils, planktic foraminiferal fauna, and some bioclasts. The calcareous nannofossil's stratigraphic distribution allows for the identification of three distinct biozones. These are Uniplanarius trifidus Interval zone (cc22), Tranolithus phacelosus Interval zone (Part) (cc23), and Reinhardites levis Interval zone (cc24), which indicate that the age of the studied Shiranish Formation in Perat anticline is estimated to span from Late Campanian to Early Maastrichtian. On the other hand, the studied section is composed of Globular Planktic Foraminiferal lime wackestone microfacies (Sh1), Keeled Planktic Foraminiferal lime wackestone microfacies (Sh2), Bioclastic lime wackestone microfacies (Sh3), Argillaceous Planktic Foraminiferal lime packstone microfacies (Sh4), and Marl lithofacies (Sh5). The formation's depositional habitats extend from the middle shelf to the upper bathyal based on the distinctive characteristics of these facies.
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