Abstract
The palaeoecology and environmental conditions prevailing during the sedimentation of the Upper Cretaceous Shiranish Formation are revealed by the interpretation and correlation of its faunal content and sedimentary facies. Lithologically, the Shiranish Formation is subdivided into two members: the Lower Shiranish Marl Member and the Upper Shiranish Shale Member. Species diversity is greater in the Lower Shiranish Marl Member and sediments are thought to have been deposited in deeper water (middle slope depth) that the sediments of the Upper Shiranish Shale Member (outer shelf depth). The Lower Shiranish Member is almost devoid of benthonic specimens of Foraminifera, indicating a low oxygen content for the waters of Lower Shiranish sea. Depositional environments 200–800 m deep in a continental margin trough of the Tethys are defined by the presence of depth-restricted benthonic foraminiferal genera and by sediment characteristics.
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