The Badenian/Sarmatian boundary in the Central Paratethys has been traditionally identified by the faunal turnover recording an important environmental change possibly controlled by the change from marine to brackish conditions. The strata below the Badenian/Sarmatian boundary in the northern Carpathian Foredeep are included into the Pecten beds, and those above it into the Syndesmya beds. Foraminiferal study of the Babczyn 2 borehole which is one of the crucial sections in the northern Carpathian Foredeep, well-known for the depositional age of rhyolite tuff within the Pecten beds dated by Śliwiński et al. (2012) at 13.06 ±0.11 Ma, indicated that in fact the boundary occurs within the Syndesmya beds. This conclusion is based upon the rapid change from a stenohaline foraminiferal fauna to a euryhaline one, and the appearance of the species Anomalinoides dividens, the taxon regarded as the marker for the Sarmatian. In the Babczyn 2 and Cieszanów 1 (located ~2.5 km basinward of Babczyn 2) boreholes, Anomalinoides dividens appears 3.1–3.8 m above the replacement of stenohaline by euryhaline foraminifers. The calcareous nannoplankton study shows that the upper Badenian and the lower Sarmatian strata in the studied sections represent the NN6, undivided NN6-NN7, and NN7 zones.

传统上，Paratethys中部的巴登尼亚/萨尔马蒂边界是通过动物群更新来确定的，该动物群记录了重要的环境变化，可能是由海洋环境向咸淡环境的变化所控制的。北喀尔巴阡山脉Foredeep的Badenian / Sarmatian边界以下的地层包括在Pecten层中，之上的层包括在Syndesmya层中。Babczyn 2井眼的有孔虫研究，该井是喀尔巴阡山脉Foredeep北部的关键断面之一，以Śliwiński等人在Pecten床中流纹岩凝灰岩的沉积年龄而闻名。（2012）在13.06±0.11 Ma，表明边界实际上发生在Syndesmya床内。这个结论是基于从有盐卤有孔虫的动物迅速转变为有盐卤的动物以及该物种的出现而得出的。异常类分裂，该分类群被视为萨马蒂人的标记。在Babczyn 2和Cieszanów1（位于Babczyn 2向后约2.5 km的钻孔）的钻孔中，异常区域的分界线出现在用乙酰胆碱有孔虫替代甜卤碱的上方3.1–3.8 m。钙质的浮游生物研究表明，研究断层中的上巴登尼亚地层和下萨马斯地层分别代表NN6，未划分的NN6-NN7和NN7带。