A Further Research on the Precambrian-Cambrian Boundary at Meishucun Section of Jinning,Yunnan, China

Abstract This paper gives a brief report on the latest results in litho-, bio-, and chrono-stratigraphy obtained from the authors' further research on the Meishucun section during 1987–1988. More attention was paid to the study of the microtexture of Lapworthella and some new materials of trace fossils. Phycodes pendum Seilacher, an important index for correlation, was also discovered in the Zhongyicun Member. In the Yu' anshan Member many worms, medusas and arthropods of the Chengjiang fauna have been found by other workers. A supplemental study was made on the fossil zones of the Meishucunian stage. Based on new isotopic data, the age of the Precambrian-Cambrian boundary should now be 597 Ma. It is further suggested that point “B” remains as an optimum selection for defining the Precambrian-Cambrian boundary.