缺氧是引起中—早寒武世（波托米阶）灭绝事件的原因新的和修订的早寒武世生物地层资料提供了生物密度和灭绝速率变化的定量分析。现在中—早寒武世灭绝事件可以被分解为两个明显的事件：著名的早期ＴｏｙｏｎｉａｎＨａｗｋｅ湾海退事件和新观察到的、但在波托米阶早期已... Hypoxia is the cause of the extinction event of the Middle-Early Cambrian (Potomac). The new and revised Early Cambrian biostratigraphy data provide a quantitative analysis of the changes in biomass density and extinction rates. Now that the Meso-Precambrian extinction event can be decomposed into two obvious events: the well-known early Hoopoe Toyonian Hawke Bay regression event and the newly observed, but early in the Potomacian era ...