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.

• 本文把华南法门阶上部和杜内阶分为4个层序，自下而上依次命名为SQ0、SQ1、SQ2和SQ3。