Recent progress in sequence stratigraphy of the Songliao Basin in northeastern China

Recent progress has been achieved on the Mesozoic sequence stratigraphy of the Songliao Basin in northeastern China. The authors have proposed that the development of the continental sequences and systems tracts are governed by relative lake-level changes. The controls of structures,climates and sediment supply are often expressed by lake-level changes,which,in turn,may be grouped into complete and incomplete cycles resulting in the models for the sequences and systems tracts. They are the lacustrine filling systems tract (FST),lacustrine expansion systems tract (EST),lacustrine inundating systems tract (IST) and lacustrine contraction systems tract (CST) and corresponding type Ⅰ sequence in the complete cycles of lakes,and the lacustrine filling systems tract (FST),lacustrine expansion systems tract (EST),lacustrine inundating systems tract (IST)and lacustrine contraction systems tract (CST) and corresponding type Ⅱ sequence in the incomplete cycles of lakes.