基本重要性目前寒武系—寒武系界限成为颇专门的研究课题以来,所提出确定界限的建议是根据其地质或物理特征,而不是纯粹根据古生物准则。然而,很明显,只有生物地层准则可导致问题得以解决,用这种晚前寒武纪和寒武纪的生物区系之间意义深长的差异,有必要采用“前寒武系—寒武系层型点放在实际上接近产生托莫特(广义的)化石组合的最老地层单位底部”的原则,这是基于界限应沿着产生大量骨骼化石的最早一个带组合底部的想法建立的。既然是这样,古杯纲、腹足纲、软舌螺纲、托莫特壳类和鳃足亚纲即属此带组合。 Basic Importance Since the current Cambrian-Cambrian boundary has become a rather specialized research topic, the proposed boundary-setting proposal is based on its geological or physical characteristics, rather than purely on paleontological criteria. However, it is clear that only biostratigraphic criteria can lead to problems being solved. With this far-reaching difference between the late Precambrian and Cambrian biota, it is necessary to use "Precambrian-Cambrian strata The point is placed on the principle that it is actually close to the bottom of the oldest stratigraphic unit producing the Totmot (generalized) fossil assemblage, based on the idea that the boundaries should be along the earliest combined bottom that produces a large number of fossilized bones. Since this is the case, the ancient cup class, Gastropoda, soft tongue tongue class, Tomodg shell and gill foot subclasses that belonged to this combination.