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在全球稳定的克拉通陆棚上,石炭纪和二叠纪陆棚浅海岩系中有50多个海进一海退沉积序列.它们为海平面升降变化导致的同时性沉积事件,这些海平面升降变化一般在100-200m水深范围内.每个海进-海退序列都可用现有化石资料进行对比,其历时为1.2-4百万年,平均约2百万年.在这些地层中,许多历时长、全球同时性不整合的出现表明化石记录是很不连续的;我们现在研究的是一个不连续的化石记录,而不是一个以极不规律的突变速率为基础的间断进化(punctuated evolution).这些晚古生代海进-海退沉积序列便于地层对比.因为岩石序对的沉积历史可支持依据动物群组合和动物群相似性在确定年代关系方面的解释.
Over the globally stable craton overhang, more than 50 seaward-receding sedimentary sequences are found in the Carboniferous and Permian shallow-shelf marine shales, which are simultaneous depositional events caused by sea-level fluctuations, Changes in lift are generally in the range of 100-200m water depth, and each sea-return series can be compared with the existing fossil data, which lasted from 1.2 to 4 million years, an average of about 2 million years in these strata, Many of the lasted ages, the emergence of global simultaneous dissimilarity, indicate that the fossil record is very discontinuous; we are now investigating a discontinuous fossil record, not a punctuated evolution based on a very irregular rate of mutation These late Paleozoic seaward-receding sedimentary sequences facilitate stratigraphic correlation because the sedimentary history of lithostratigraphic pairs supports the interpretation of the relationship between age based on the similarity of fauna and fauna.