A conodont-based high-resolution eventostratigraphy and biostratigraphy for the Permian–Triassic boundaries in South China

Wang Cheng-yuan

pp. 234-248, 1 plate, in English

Abstract:

The Permian–Triassic boundaries in South China may be strictly classified into the eventostratigraphic boundary and the biostratigraphic boundary respectively. The basal limit of "boundary clay" bed is known as the eventostratigraphic boundary, whereas biostratigraphic boundary can't be defined in relation with the "mixed beds" or the "transitional beds" altogether. The Zhongxin Dadui (Brigade) Section at Baoqin of Huicang, Changxing, is known as the best GSSP of the Permian–Triassic boundary. In terms of definitions, the P/T biostratigraphic boundary is the first appearance of Hindeodus parvus Morphotype 1. It falls within the boundary bed 2 (=Mixed bed 2 of Sheng et al., 1984), 15 cm higher than the eventostratigraphic boundary at Zhongxin Dadui Section. The first appearance of the Hindeodus parvus Morphotype 1 is also the Upper limit of the Changhsingian Stage.

Keywords: Permian–Triassic (P/T) boundary clay, eventostratigraphy, biostratigraphy, H. parvus M. 1, Changxing, China