(Table 2) Stratigraphic marker taxa in ODP Hole 162-985A sediments@en

The rich and diverse dinocyst assemblages in Cores 162-985A-32X through 62X confirm the importance of these microfossils in unraveling the evolution of the Norwegian Sea. Cosmopolitan taxa, with well-documented stratigraphic ranges in northwest Europe, indicate the following ages: Sections 162-985A-62X-1 through 51X-2, Rupelian (early Oligocene); 50X-5, Oligocene, possibly Chattian; 48X-6, Aquitanian? (early Miocene); 48X-4 through 37X-5, Aquitanian (early Miocene); and 36X-5 through 32X-1, Burdigalian (early Miocene). This stratigraphic interpretation suggests that a major hiatus, which can be correlated with an apparently coeval hiatus at Site 643, occurs within the Chattian at Site 985. Several endemic dinocyst taxa with unusual morphology and restricted stratigraphic occurrences are present in Hole 985A and other Norwegian Sea sites, especially Site 643. By using Hole 985A data for control, the Oligocene-Miocene sediments can be correlated with some degree of confidence in the Norwegian Basin.162-985A站位32X至62X岩芯段中产出的丰富多样的沟鞭藻囊孢（dinocyst）组合，证实了这类微体化石在解析挪威海演化历程中的关键价值。那些在西北欧洲已有详实地层延限记录的广布型类群，指示了如下沉积时代：162-985A-62X-1至51X-2岩芯段对应鲁培尔期（渐新世早期）；50X-5岩芯段对应渐新世，大概率为恰特期；48X-6岩芯段可能为阿基坦期（早中新世）；48X-4至37X-5岩芯段对应阿基坦期（早中新世）；36X-5至32X-1岩芯段对应布尔迪加尔期（早中新世）。该地层学解释表明，985站位恰特阶内部存在一处重大沉积间断，该间断可与643站位同期出现的沉积间断相对比。985A钻孔中还产出了若干形态特殊、地层产出范围受限的地方性沟鞭藻囊孢类群，此类类群在挪威海其他站位（尤其是643站位）中也有发现。以985A钻孔的数据作为约束依据，可在一定置信度下实现挪威海盆内渐新统-中新统地层的对比关联。