Ostracod assemblages in late Quaternary varved glaciomarine clay of the Baltic Sea Yoldia stage in eastern middle Sweden

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• 作者：Schoning ; Kristian ; Wasteg&aring ; rd ; Stefan
• 关键词：Baltic Sea ; Yoldia Sea ; ostracods ; palaeosalinity ; varved clay ; Quaternary
• 刊名：Marine Micropaleontology
• 出版年：1999
• 出版时间：September, 1999
• 年：1999
• 卷：37
• 期：3-4
• 页码：313-325
• 全文大小：846 K

文摘

Four cored sites in eastern middle Sweden have been analysed for their content of calcareous fossils. The investigated sediments consist of late Quaternary varved clay deposited during the Baltic Sea Yoldia stage. Four regional palaeoecological units, A–D, have been established. Unit A reflects ice-proximal conditions, unit B optimal conditions for the benthic fauna and unit C the termination of a saline phase. In unit C oxygen deficiency might have occurred. In the fourth unit, D, no fossils were found. The fauna recorded is poor in taxa and indicates a weak marine influence. The salinity was higher in the western part of the investigated area due to the proximity to the inlet of marine water. The meltwater influx was high and the salinity probably fluctuated considerably. The ostracod Cytheromorpha macchesneyi (Brady and Crosskey) is reported for the first time in Quaternary deposits from northwestern Europe and indicates that a connection could have existed between the Baltic and the White Sea in Late Glacial times.