摘要
本文以生物绝灭及生物新生为主线,论述了国内外晚前寒武纪的几个主要生物出现事件——宏观藻类出现事件;后生软躯体动物出现与绝灭事件;带壳动物出现事件.通过这些生物事件,讨论了震旦-寒武系界线目前存在的几种看法,指出了震旦-寒武系界线选在A点是有足够的生物学基础的,同时此界线也是一条重要的事件地层界线.
Taking the extinction of biota and the appearance of biota as a main line, this article described several main events of the appearance of biota in the late Precambrian at home and abroad the events of the appearance of macroalga (the Sangshgu'an biota, the Longfensha biota),the events of thd appearance and extinction of meta-soft-bodied animals (the Huainan biota, the Ediacara fauna, the Xilinxia biota, the Miaohe biota), and those of the appearance and extinction of the Shelly fauna (the Meishucun biota and the Kuanchanpu biota). Through these biological events the current views on the boundary of the Sinian and Cambrian systems are discussed and it is shown that the selected location of the boundary of Sinian and Cambrian systems on the Point A has enough biologecal arguments. At the same time, this boundary is also an important event stratigraphy boundary.
基金
国家自然科学基金资助项目
关键词
生物事件
藻类
前寒武纪
地层界线
Biota event
Macro-alga
Meta-animals
Shelly fossils
Event stratigraphy boundary
