Die Art Pontosphaera indooceanica n. sp. und ihre Bedeutung für die Stratigraphie der jüngsten Sedimente des Indischen Ozeans

• Main Author: Cepek, Pavel
• Format: Article in Journal/Newspaper
• Language: German
• Published: Bornträger 1973
• Subjects: Planktonic foraminifera
• Online Access: https://oceanrep.geomar.de/id/eprint/56589/; https://oceanrep.geomar.de/id/eprint/56589/1/Cepek_P_1973.pdf

A preliminary investigation of the coccoliths from the sediments of the Arabian Sea has shown that all studied cores belong to the Emiliania huxleyi-zone, the youngest coccolith zone according to E. BOUDREAUX & W. W. HAY (1967). The species Emiliania huxleyi (LOHMANN, 1902) occurs in the deepest samples of the investigated piston cores. It can be shown that the species Pontosphaere indooceanica n. sp., which was observed only in the lower parts of the cores disappears in the upper parts. The boundary, defined by the presence and absence of Pontosphaera indooceanica n. sp. is slightly higher than the boundary between planktonic foraminifera preferring cool water and those associations living in warmer water (ZOBEL, this no). The boundary is always above that characterized by certain qualitative and quantitative changes in the sediments composition described by ECKHARDT, MATTIAT & PETERS (in print) and V. STACKELBERG (1972). Further investigations are required to find out whether the biostratigraphic boundary defined by the disappearance of Pontosphaera indooceanica n. sp. corresponds to a world-wide coccolith zone.