The Devonian–Carboniferous boundary is associated with a major extinction event of the Phanerozoic. It was also a time marked by a rapid but short-lasting change in deposition called Hangenberg Event. In the Namur–Dinant Basin the uppermost Devonian (‘Strunian’) deposits recorded a third-order transgression that produced a progressive switch from coastal siliciclastic to proximal mixed deposits with an increase of the carbonate production on the ramp. Hence, the Comblain-au-Pont and lower Hastière formations are considered as the transgressive system tract, whereas the middle member of the Hastière Formation is interpreted as the highstand system tract, capped by an erosion surface corresponding to the third-order sequence boundary. Superimposed on these third-order sequences are well-marked orbitally forced precession cycles (wet–dry climate alternations) of c. 18.6 ka, appearing as irregular c. 30–80-cm-thick couplets of limestone and calcareous shale beds. The Hangenberg Black Shale Event is locally present as dark shales that likely spread over the shelf, marking the maximum flooding surface of the sequence. Before and after this event, carbonate facies rich in benthic macrofauna and microfauna continued to develop. The Hangenberg Sandstone Event, appearing as a sandstone bed in pelagic sections, is variously recorded at the base of the Hastière Formation, either as a sandy siltstone bed in proximal sections or as a horizon with limestone clasts and reworked fossils in more distal settings. The Hangenberg Sandstone Event beds occur sharply in the stratigraphic record and do not correspond to the long sea level fall of a third-order sequence boundary, but most probably to a short out-of-sequence event. The revision of the stratigraphic distribution of major fossil groups pleads for a continuous biostratigraphic succession with no obvious hiatus. The variable development of some micropalaeontological zones at the end of the Devonian is the result of complex eco-biostratigraphic interactions with the environment rather than the reflection of true hiatuses. It is marked by extinctions of Devonian taxa, concomitantly with the end of the reworking produced by the Hangenberg Sandstone Event, most probably immediately below the entry of the conodont Protognathodus kockeli. It is also coincident with the boundary between the foraminiferal zones DFZ7–MFZ1, rugose coral zones RC0–RC1 and between the palynozones LE–VI. After the short-lasting regressive phase of the Hangenberg Sandstone Event, normal depositional settings returned with the deposition of the Hastière Formation. Hence, the end of the Hangenberg Sandstone Event is proposed as the most natural proxy to pinpoint the Devonian–Carboniferous boundary.

泥盆纪-石炭纪边界与生代时代的一次大灭绝事件有关。这段时间也以沉积迅速而短暂的变化为标志，即Hangenberg事件。在那慕尔—迪南盆地，最高的泥盆纪（“史特鲁年”）沉积记录了一次三级海侵，随着斜坡上碳酸盐岩产量的增加，产生了从沿海硅质碎屑岩向近端混合沉积的逐步转变。因此，将Comblain-au-Pont和下Hastière地层视为海侵系统道，而将Hastière地层的中段解释为高台地系统道，并以与三阶层序边界相对应的侵蚀面为上盖。叠加在这些三阶序列上的是c的明显标记的轨道强迫进动周期（干湿气候变化）。18.6 ka，表现为不规则c。30-80厘米厚的le联石灰岩和钙质页岩床。Hangenberg黑色页岩事件在当地以深色页岩存在，可能散布在架子上，标志着该层序的最大洪泛面。在该事件之前和之后，富含底栖大型动物区系和微动物区系的碳酸盐岩相继续发育。洪堡砂岩事件在上层剖面中以砂岩层的形式出现，在哈斯梯尔地层的基础上有多种记录，在近端区域为砂质粉砂岩层，或在较远的地方为石灰岩碎屑和重做的化石所形成的层位。Hangenberg砂岩事件床在地层记录中急剧出现，并不对应于三阶层序边界的长时间海平面下降，但最有可能是短时间的乱序事件。主要化石群的地层分布的修正导致连续的生物地层演替，没有明显的裂隙。泥盆纪末期某些微古生物学带的变化发育是与环境复杂的生态-生物地层学相互作用的结果，而不是真实裂隙的反映。它的特征是泥盆纪生物的灭绝，伴随着汉堡岩砂岩事件的重制工作的结束，很可能紧接在牙形石入口下方 但很可能是短暂的乱序事件。主要化石群的地层分布的修正导致连续的生物地层演替，没有明显的裂隙。泥盆纪末期某些微古生物学带的变化发育是与环境复杂的生态-生物地层学相互作用的结果，而不是真实裂隙的反映。它的特征是泥盆纪生物的灭绝，伴随着汉堡岩砂岩事件的重制工作的结束，很可能紧接在牙形石入口下方 但很可能是短暂的乱序事件。主要化石群的地层分布的修正导致连续的生物地层演替，没有明显的裂隙。泥盆纪末期某些微古生物学带的变化发育是与环境复杂的生态-生物地层学相互作用的结果，而不是真实裂隙的反映。它的特征是泥盆纪生物的灭绝，伴随着汉堡岩砂岩事件的重制工作的结束，很可能紧接在牙形石入口下方 泥盆纪末期某些微古生物学带的变化发育是与环境复杂的生态-生物地层学相互作用的结果，而不是真实裂隙的反映。它的特征是泥盆纪生物的灭绝，伴随着汉堡岩砂岩事件的重制工作的结束，很可能紧接在牙形石入口下方 泥盆纪末期某些微古生物学带的变化发育是与环境复杂的生态-生物地层学相互作用的结果，而不是真实裂隙的反映。它的特征是泥盆纪生物的灭绝，伴随着汉堡岩砂岩事件的重制工作的结束，很可能紧接在牙形石入口下方原生动物种科克利（Protognathodus kockeli）。它也与有孔虫区DFZ7–MFZ1，皱纹珊瑚区RC0–RC1以及古植物区LE–VI之间的边界重合。在Hangenberg砂岩事件短暂的回归期之后，正常的沉积环境随Hastière组的沉积而恢复。因此，Hangenberg砂岩事件的结束被认为是确定泥盆纪-石炭纪边界的最自然的代理。