(Table 1) Planktonic foraminifer abundance and stable isotope ratios of a sediment core near Baddeckenstedt, north Germany

A refined sample processing technique using glacial acetic acid has been applied to Upper Cenomanian and Lower Turonian limestones from Baddeckenstedt (Lower Saxony) enabeling the first quantitative analysis of planktonic foraminiferal populations through the Stage boundary succession in northwestern Germany. Measurements of carbonate contents, organic carbon and stable carbon and oxygen isotopes were also reported. These data allow a correlation to be made of the Baddeckenstedt section with those at Misburg (basinal facies, northwestern Germany) and Dover (Plenus Marls, southern England). Significant maxima of the organic carbon content at Baddeckenstedt correspond to prominent black shale couplets at Misburg. The planktonic foraminiferal generic groups show at Baddeckenstedt similar fluctuations as reported from Dover. Their correlation reveals details of a complex paleoceanographic regime in the NW-German Basin during the Cenomanian/Turonian Oceanic Anoxic Event.

研究采用冰乙酸（glacial acetic acid）改良的样品处理技术，对德国下萨克森州巴德克登施塔特（Baddeckenstedt）地区的晚塞诺曼阶（Upper Cenomanian）及早土仑阶（Lower Turonian）灰岩开展分析，首次实现了德国西北部该阶界线连续沉积序列中浮游有孔虫（planktonic foraminifera）种群的定量分析。同步测定了碳酸盐含量、有机碳以及稳定碳、氧同位素数值。上述数据可实现巴德克登施塔特剖面与德国西北部米斯堡（Misburg，盆地相（basinal facies））及英格兰南部多佛（Dover，普莱努斯泥灰岩（Plenus Marls））剖面的地层对比。巴德克登施塔特地区有机碳含量的显著峰值，与米斯堡地区标志性的黑色页岩互层一一对应。巴德克登施塔特地区浮游有孔虫的属类群组合，其波动特征与多佛地区的已有报道结果高度相似。二者的对比分析揭示了德国西北部盆地在塞诺曼阶/土仑阶大洋缺氧事件（Cenomanian/Turonian Oceanic Anoxic Event）期间复杂古海洋环境体系的细节特征。