The Nasiłów section represents the uppermost part of the Middle Vistula River section, a classical Polish extra-Carpathian Cretaceous section, and gives access to the Cretaceous–Paleogene (K-Pg) boundary interval. Despite many papers that have been published so far, our newly collected data shed new light on the completeness of biostratigraphic and sedimentary records of the K-Pg at that site. The Nasiłów section encompasses the upper Maastrichtian regional XII and XIII foraminiferal assemblage zones and the lower Danian P0?-Pα standard planktonic foraminiferal zones. The K-Pg boundary is placed at the top of a phosphatic layer. The grey marly chalk unit, never before subjected to examination of biostratigraphically important taxa, displays blooms of guembelitrids pointing to the uppermost Maastrichtian (XIII foraminiferal assemblage Zone) as well as of planktonic and benthic foraminifers of a reduced test size. Such foraminiferal dwarfism is commonly observed near the end of the Cretaceous and interpreted as a response to the Deccan volcanism (possible 2nd phase) that caused climate changes and ocean acidification. The terminal Maastrichtian age of the marly chalk unit is additionally supported by an acme of the dinoflagellate cyst Palinodinium grallator, together with Tallasiphora pelagica and Disphaerogena carposphaeropsis. The “Greensand”, a distinct glauconite-quartz sand unit, contains exclusively terminal Maastrichtian planktonic foraminifers and dinoflagellate cyst assemblages. Individual specimens of Danian age are interpreted to be either an effect of contamination or were translocated down by burrowers into the Greensand. The lowermost portion of the Siwak (informal lithostratigraphic unit) demonstrates an early Danian age based on the co-occurrence of the common planktonic foraminifers Globoconusa daubjergensis, Guembelitria cretacea, Muricohedbergella monmouthensis, M. planispira, Planoheterohelix globulosa, Parvularuglobigerina extensa and P. alabamensis. The last occurrence of Palynodinium grallator and the first occurrences of Carptella cornuta and Senoniasphaera inornata, recorded directly above the phosphatic layer, support the same age assignment. The new palaeomagnetic data cannot prove remagnetization at the boundary interval, in contrast to previous research which gave support to a hiatus in the critical interval

Nasiłów 段代表了中维斯瓦河段的最上部，这是一个经典的波兰喀尔巴阡系白垩纪外段，可以进入白垩纪-古近纪 (K-Pg) 边界区间。尽管迄今为止已经发表了许多论文，但我们新收集的数据为该地点 K-Pg 的生物地层和沉积记录的完整性提供了新的线索。Nasiłów 剖面包括上马斯特里赫特地区 XII 和 XIII 有孔虫组合区和下大年 P0?-Pα 标准浮游有孔虫区。K-Pg 边界位于磷酸盐层的顶部。灰泥灰粉笔单元，以前从未接受过对生物地层重要分类群的检查，展示了指向最上层马斯特里赫特（XIII 有孔虫组合区）的 guembelitrids 的大量繁殖，以及测试尺寸减小的浮游和底栖有孔虫。这种有孔虫侏儒症通常在白垩纪末期观察到，并被解释为对导致气候变化和海洋酸化的德干火山活动（可能是第二阶段）的反应。马里白垩系的终末马斯特里赫特时代还得到了甲藻囊肿的顶点支持Palinodinium grallator，连同Tallasiphora pelagica和Disphaerogena carposphaeropsis。“绿沙”是一种独特的海绿石-石英砂单元，仅包含马斯特里赫特岛的末端浮游有孔虫和甲藻囊肿组合。大年时代的个体标本被解释为污染的影响或被挖洞者转移到绿沙中。所述锡瓦格（非正式岩石地层单位）的最下部分表明基于公共浮游有孔虫的共同出现的早期年龄大年Globoconusa daubjergensis，Guembelitria cretacea，Muricohedbergella monmouthensis，M. planispira，Planoheterohelix globulosa，Parvularuglobigerina广延和阿拉巴马假单胞菌。最后一次出现Palynodinium grallator和第一次出现Carptellacornuta和Senoniasphaera inornata，记录在磷酸盐层正上方，支持相同的年龄分配。新的古地磁数据不能证明在边界区间有再磁化，这与先前支持临界区间中断的研究形成对比