华南二叠－三叠系的事件地层与生物地层界线

华南二叠－三叠系界线研究应严格区分事件地层界线与生物地层界线。“界线粘土”层的底界即为事件地层界线。生物地层界线定义不能与“混生层”或“过渡层”的概念连在一起。长兴煤山忠心大队剖面是最好的二叠－三叠系全球界线层型剖面点（ＧＳＳＰ）。二叠－三叠系生物地层界线定义为ＨｉｎｄｅｏｄｕｓｐａｒｖｕｓＭｏｒｐｈｏｔｙｐｅ１的首次出现,其位置就在长兴剖面界线层（混生层）２的内部,比事件地层界线高１５ｃｍ。ＨｉｎｄｅｏｄｕｓｐａｒｖｕｓＭｏｒｐｈｏｔｙｐｅ１的首次出现,即为长兴阶的顶界。

Eventostratigraphic boundary and biosttatigraphic boundary of the Permian-Triassic in South China

Eventostratigraphic boundary and biostratigraphic boundary have to be clearly distinguished in the study of the Permian-Triassic boundary in South China. The hasal boundary of the "Boundary Clay" at the Changxing sections is a good marker for the eventostratigraphic boundary. The definition of the biostratographic boundary can not be connected with the concept of the "Mixed beds" or "Transiti onal beds". A revised definition of the Permian-Triassic biostratigraphic boundary should be: the first appearence of Hindeodus parvus Morphotype 1. This boundary falls within the "boundary bed 2"(="mixed bed 2") at the Zhongxin Dadui Section of the Meishan, Changxing, 15cm higher than the eventostratigraphic boundary. This boudary is also the upper limit of the Changhsingian Stage. The Zhougxin Dadui Section at the Meishan of Changxing is a desirable GSSP for the Permian-Triassic boundary.