The foraminiferal contents of the Paleocene-Eocene successions were examined in two sections; at the southern and northern flanks of Chenareh anticline, Lorestan Zone. The Paleocene-Eocene in northern flank was subdivided into three formations from older to younger: Taleh Zang, Kashkan, and Shahbazan formations. During this time, sedimentation of the Paleocene-Eocene Pabdeh and Shahbazan formations took place in the southern flank of Chenareh anticline. Four biostratigraphical zones were defined in Pabdeh Formation as a result of summarizing available data on the taxonomy, stratigraphical range and occurrence of planktic foraminifera, ranging in age from Late Danian to Early Ypresian. The zones are: Praemurica uncinata Interval Zone (P2); Morozovella angulata-Igorina pussila Interval Zone (P3); Globanomalina pseudomenardii Total Range Zone (P4); Morozovella velascoensis Interval Zone (P5). The Taleh Zang Formation and upper part of the Pabdeh Formation contain a rich and diverse assemblage of alveolinids, and nummulitids (Nummulites, Assilina). Their assemblages, referred to SBZ 6, 7 and SBZ 8 (Early Ypresian). The Shahbazan Formation has no index fossils, and it was attributed to Lutetian in age, based on stratigraphic position.

古新世-始新世序列的有孔虫含量分两个部分进行了检查；在洛雷斯坦区切纳雷背斜的南侧和北侧。北翼的古新世-始新世由老到新细分为三个组：Taleh Zang组、Kashkan组和Shahbazan组。在此期间，古新世-始新世 Pabdeh 和 Shahbazan 地层的沉积发生在 Chenareh 背斜的南翼。作为总结有关分类学、地层范围和浮游有孔虫发生率的现有数据的结果，在 Pabdeh 组中定义了四个生物地层带，年龄范围从大尼期晚期到伊普勒斯早期。这些区域是：Praemurica uncinata间隔区（P2）；角果莫罗佐维拉-Igorina pussila间隔区（P3）；Globanomalina pseudomenardii总范围区（P4）；Morozovella velascoensis间隔区 (P5)。Taleh Zang 组和 Pabdeh 组上部包含丰富多样的 alveolinids 和 nummulitids ( Nummulites , Assilina ) 组合。他们的组合，称为 SBZ 6、7 和 SBZ 8（早期伊普勒斯）。Shahbazan组没有索引化石，根据地层位置，它在年龄上归属于Lutetian。