Upper Devonian and Lower CarboniferousSequence Stratigraphy of South China
华南上泥盆统和下石炭统层序地层学

In South China four depositional sequences are recognized in the upper part of Upper Devonian and Tournaisian. They are named SQ1, SQ2, SQ3 and SQ4 in ascending order. SQ1 is Strunian (uppermost Devonian), and the other three Tournaisian in age. These four depositional sequences are very well correlated with these four sequences recognized in Europe, North American and other areas. This suggests that these sequences are cynchronous deposits resulting from eustatic sea Level changes. The study of sequence stratigraphy, biostratigraphy and event stratigraphy indicates that in neritic facies areas of South China, the Devonian Carboniferous Boundary, matching the boundary between Siphonodella praesulcata Zone and S . sulcata Zone in pelagic facies areas, is not only higher than the top of the Cystophrentis Zone, but also higher than the top of the Devonian Carhoniferous boundary event. In neritic facies areas, therefore, the Devonian Carboniferous Boundary is marked by the most distinct transgressive surface within the Cystophrentis Pseudouralina Interval Zone, i.e. the base of the TST of the SQ1. This boundary just coincides with the top surface of the event beds resulting from the eustatic fall of sea level, and approximately corresponds to the basal part of Pseudouralina Assemblage Zone.