★ Global Chronostratigraphy, High-precision Stratigraphy and Comprehensive Stratigraphy: The goal of this research direction is to establish a global chronostratigraphic system and to provide a universal time scale for the study of Earth history and the process of life. Primary interests include the establishment of Chinese standards for the Cambrian and Ordovician systems, and the global stratotype section and points (GSSPs) for the Middle/Upper Cambrian boundary, the Cambrian/Ordovician boundary, the Silurian/Devonian boundary, and the Jurassic/Cretaceous boundary, as well as the stage boundaries within the Lopingian (upper Permian) in China.
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