AN APPROACH TO THE SEDIMENTARY FACIES OF THE LARGE LACUSTRINE BASIN WATER-TRANSGRESSION DELTA IN SONGLIAO

This article discusses the sedim entary features of the delta of the Salatu and Putaohua pays, exemplifying by the Bei'an-Xingshugang Delta with the most plentiful informations available. It is pointed out that the delta in the Putaohua pay in K₁y¹ is a lacustrine water-transgression delta, whereas that in K₁y^1-2 and K₁y³ is one with a lacustrine water-transgressive background, and the sand bodies in Sa0 and SaI formations are of turbidity deposits. Patterns of both facies and the sand bodies are also covered.