早寒武世时期涌现并发育了许多带骨骼的生物类群:多孔动物、古杯类、软体动物(单板类、腹足类、头足类、软舌螺类)、节肢动物(三叶虫、介形虫)、?苔藓动物、腕足类以及其它一些分类位置至今仍不明的类群(盘软舌螺类、拉氏螺类、似榍壳类、牙形刺状物等等)。许多研究者的成果证实,虽然直到不久以前在下寒武纪生物地层学中三叶虫仍占主导地位,然而就在最后的 Olenellus 带三叶虫出现之前很早,就已经发现了首次出现的古 During the Early Cambrian, many biological groups with skeletal features emerged and developed: porous animals, ancient cups, molluscs (veneers, gastropods, cephalopods, soft tongue snails), arthropods , Ostracods), bryozoans, brachiopods, and other taxonomic groups that remain unknown to date (Brachyspira sp., Lasius sp., Scallops, Tooth-shaped spines, etc.). The results of many researchers confirm that although the trilobite still dominated the Lower Cambrian bio-stratigraphy long ago, the first paleo-ancient