寒武系全球排碧阶及芙蓉统底界的标准层型剖面和点位

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国际地球科学联合会2003年2月批准了由中美科学家组成的联合研究小组的建立全球排碧阶和芙蓉统底界标准层型剖面和点位的提案,以我国地名命名的“排碧阶”和“芙蓉统”两个全球年代地层单位及其底界的全球层型正式确立,这是寒武系内所确立的第一个“金钉子”。排碧阶和芙蓉统分别是寒武系的首个全球阶级标准单位和首个全球统级标准单位。排碧阶和芙蓉统的共同底界的全球层型剖面位于湖南花垣排碧附近的四新村,底界划在该剖面花桥组底界之上369.06m,与球接子三叶虫Glyptagnostus retuculatus的首现一致。芙蓉统的建立,取代了长期使用的非正式年代地层单位“上寒武统”。 In February 2003, the International Union of Geological Sciences endorsed the proposal of a joint research group composed of scientists from China and the United States to establish a standard hierarchical profile and point of global order for the boundary layers of the blue and the hibiscus. The “ ”And“ Hibiscus ”two global strata and the bottom of the world strata formal establishment, this is the Cambrian established within the first“ golden nails. ” Pai Bi and Hibiscus are respectively the first global class standard unit and the first global standard unit in the Cambrian. The global stratigraphic section of the common boundary between the Pai-bikou and the Hibiscus is located at Sisincun near Paibi, Huayuan, Hunan Province. The bottom boundary is 369.06m above the bottom boundary of the Huaqiao Formation in this section and is similar to the Glyptagnostus retuculatus The first show of the same. The establishment of Hibiscus, replacing the long-term use of informal chronostratigraphy “Upper Cambrian.”
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