The Sarhlef Formation, which hosts the massive sulphide deposits of the Moroccan Meseta, has been considered as Carboniferous in age. Moreover, palynological analysis of the black shales hosting the Draa Sfar deposit (Central Jebilet) has allowed to restrict the age of the Sarhlef Formation to the late Visean (Asbian). However, this age is not compatible with geochronological data of various magmatic intrusions present in Central Jebilet. New biostratigraphic results based on metamorphosed conodonts from 34 samples (three cores, DS170, DF306 and DS125) of the Draa Sfar deposits provide a new biostratigraphic framework of the Sarhlef Formation. The collected fauna is affected by pyritization, silicification and tectonic deformation. Some non-pyritised or partially pyritized conodonts show a conodont color alteration (CAI) change varying from black to translucent (CAI 5 to CAI 8). The conodont fauna comprise representatives of the genera Icriodus, Polygnathus, Ancyrodella, Palmatolepis, Ancyrognathus, Ancyroides, and Palmatolepis showing that age spans from the Frasnian to Late Famennian. This age is more compatible with the radiometric data of the intrusive magmatic rocks. In core DS170, the Upper Kellwasser Horizon at the Frasnian-Famennian boundary has been identified by lithological characteristics and stratigraphy. The proposed Late Devonian age of the Sarhlef Formation provides new insights on the geological evolution and stratigraphy of the entire region.

拥有摩洛哥Meseta大量硫化物矿床的Sarhlef组在年龄上被认为是石炭纪的。此外，对进行Draa Sfar矿床（中部Jebilet）的黑色页岩进行的孢粉学分析已将Sarhlef组的年龄限制在晚Visean（Asbian）。但是，这个年龄与杰比勒特中部存在的各种岩浆侵入的年代学数据不符。基于Draa Sfar矿床的34个样品（三个岩心，DS170，DF306和DS125）的变质牙形石的新生物地层学结果提供了Sarhlef组新的生物地层学框架。这采集的动物群受到黄铁矿化，硅化作用和构造变形的影响。一些未黄化或部分黄化的牙形石显示牙形石颜色变化（CAI）变化，从黑色到半透明（CAI 5到CAI 8）。牙形动物区系包括鸢尾科，Polygnathus，Ancyrodella，Palmatolepis，Ancyrognathus，Ancyroides和Palmatolepis属的代表，它们的年龄范围从弗拉斯尼人到法门尼西亚晚期。这年龄与侵入岩浆岩的辐射数据更兼容。在DS170岩心中，通过岩性特征和地层学已经确定了Frasnian-Famennian边界的上凯尔瓦瑟地平线。拟议的萨勒夫组晚泥盆世年龄为整个地区的地质演化和地层学提供了新的见识。