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生物段(biomere)是大陆的或较大范围的演化程序,可以包括几个生物带,并为定义严格的灭绝事件所限定.生物段在北美寒武纪地层中发育最好.当然,灭绝事件影响到所有三叶虫,也可能涉及寒武纪其他动物群.在几个含化石的剖面中,生物段界线通常位于岩性均一的厚仅1厘米的地层中.有些地区,这一界线位于基底面上.在生物灭绝事件中,没有发现与陨石碰撞有关的地球化学异常.在由地球本身所引起的灭绝事件的诸因素中,斜温层的迅速上升或广泛缺氧事件均应在测试中予以注意.
Biomere is a continental or large-scale evolutionary program that can include several zonules and is defined by the definition of a strict extinction event. The biomere is best developed in the North American Cambrian stratigraphy. Of course, the extinction event Affects all trilobites and may also be related to other Cambrian fauna In several fossil-bearing sections, the boundary of the bio-segment is usually located in a homogeneous formation of lithology that is only 1 cm thick, and in some areas, On the basal plane, no geochemical anomalies associated with the collision of meteorites were found in the event of biological extinction, and the rapid increase in temperature of the temperature layer or extensive hypoxia among the elements of the extinction event caused by the Earth itself should be tested In the attention.