The North Alpine Foreland Basin (NAFB) comprises one of the most complete sedimentary records of the Oligocene and Miocene. Driven by global sea-level fluctuations, vast sedimentary influx and tectonic movement. The locality of Unterrudling near Eferding (Upper Austria) exposes the largest succession of sedimentary deposits from the late Oligocene in the eastern NAFB. Additionally, this section shows the facies transition from the shallow-water Linz-Melk Formation to the deep-water Eferding Formation. In this work, the fossil fauna and flora of the Eferding Formation as well as its lithology are re-evaluated using a multidisciplinary approach to gain new insights into the palaeoenvironment, palaeoclimate, and palaeoecology. A transgressive sequence is documented using sedimentological and ichnological data. Furthermore, a correlation to the late Chattian transgressive Ch-3 sequence is suggested. The impact of rising sea level on marine biota is shown in detail by analysing various groups (Bivalvia, Echinodermata, Anthozoa, Foraminifera, Chondrichthyes, Osteichthyes), with several newly reported species from the Eferding Formation. Moreover, washed in plant material was analysed for the interpretation of the terrestrial climate indicating mainly humid subtropical conditions. Finally, the presence of phosphatic nodules indicates eutrophication on the shelf environment and the possibility of upwelling currents.

北高山前陆盆地 (NAFB) 是渐新世和中新世最完整的沉积记录之一。受全球海平面波动、大量沉积物涌入和构造运动的驱动。Eferding（上奥地利）附近的 Unterrudling 地区暴露了 NAFB 东部渐新世晚期最大的沉积沉积层。此外，本节还显示了从浅水林茨-梅尔克组到深水 Eferding 组的相转变。在这项工作中，使用多学科方法重新评估 Eferding 组的化石动植物群及其岩性，以获得对古环境、古气候和古生态学的新见解。使用沉积学和地质学数据记录了海侵序列。此外，建议与晚期 Chattian 海侵 Ch-3 序列相关。通过分析各种群体（双壳纲、棘皮动物、珊瑚虫、有孔虫、软骨鱼、硬鱼）以及来自 Eferding 组的几个新报告物种，详细显示了海平面上升对海洋生物群的影响。此外，对植物材料中的洗涤进行了分析，以解释主要是潮湿的亚热带条件的陆地气候。最后，磷酸盐结核的存在表明陆架环境富营养化和上升流的可能性。与来自 Eferding 组的几个新报告的物种。此外，对植物材料中的洗涤进行了分析，以解释主要是潮湿的亚热带条件的陆地气候。最后，磷酸盐结核的存在表明陆架环境富营养化和上升流的可能性。与来自 Eferding 组的几个新报告的物种。此外，对植物材料中的洗涤进行了分析，以解释主要是潮湿的亚热带条件的陆地气候。最后，磷酸盐结核的存在表明陆架环境富营养化和上升流的可能性。