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自从1986年殷鸿福等人提出以牙形石Hindeodus parvus作为定义二叠-三叠系界线的标志化石以后,越来越多的地层学和古生物学工作者已经接受了这种观点。这样一来,牙形石就取代了先前作为二叠-三叠系界线层型标志化石的菊石的重要位置,同时我国浙江长兴煤山剖面亦就具有竞争国际二叠-三叠系界线层型剖面和点的优势。1993年国际二叠-三叠系界线工作组正式将煤山剖面列为4个国际二叠-三叠系界线层型候选剖面之一。
Since 1986, when Yin Hongfu et al. Proposed the conodont Hindeodus parvus as the hallmark fossil defining the Permian-Triassic boundary, more and more stratigraphic and paleontological workers have accepted this view. In this way, the conodont will replace the previous position of the aperitif that is the boundary marker of the Permian-Triassic boundary line, and the Meishan section of Changxing, Zhejiang Province will compete with the international Permian-Triassic boundary line Profile and point advantages. In 1993, the International Permian-Triassic Boundary Working Group officially listed the Meishan section as one of four international Permian-Triassic boundary line candidate profiles.