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在前阿特拉斯山,在赫普(Hupe)的 Fallotaspis tazemmourtensis 带下发现了三叶虫,甚至有一些三叶虫出现在该区第一古杯化石带的下面。这些三叶虫大部属后颊目(如已描述的 Hupetina gen.nov.),Olenellid Eofallotaspis gen.nov.可能是Fallotaspis 的先躯分子。其时代不新于西伯利亚地台的下阿特达班阶的时代。在大阿特拉斯山,在所谓的乌尼安(Ounein)区,研究了一个从下寒武下部至中寒武统的含三叶虫的完整剖面,此处见到的最老三叶虫是新属 Lemdadella。它与前阿特拉斯山或其它地区的对比尚未确定。
Trilobites were found in the former Atlas Mountains under the belt of Fallotaspis tazemmourtensis in Hupe, and some trilobites were found beneath the first ancient cup-fossil zone in the area. These trilobites are mostly posterior buccal (as described by Hupetina gen.nov.), Olenellid Eofallotaspis gen.nov. May be the precursor of Fallotaspis. Its era is not new in the era of the lower Athabasca platform on Siberia. At the Great Atlas Mountains, in the so-called Ounein area, a complete cross-section of Trilobite from the lower Cambrian to the middle Cambrian was studied. The oldest three-leaf Insect is a new genus Lemdadella. Its comparison with the former Atlas Mountains or elsewhere has not yet been established.