Sinian-Cambrian boundary of Meishucun and Wangjiawan, Jinning County, Yunnan

Abstract

This papers deals with the Sinian-Cambrian boundary reference sections and reference points of Meishucun and Wangjiawan, Jinning County, Yunnan. The stratigraphic section of Meishucun is characterized by a continuous marine sequence of mono-phase, fair outcrops and abundant fossils. It is easily accessible, well preserved and was studied long ago. It may serve as an ideal Sinian-Cambrian boundary type section and boundary point. It is the section on which the Meishucun stage is established, too. The Wangjiawan section is also a comparatively good boundary type reference section and reference point. The phosphate bed in this section is thick and forms a continuous sequence with the underlying Dengying formation.