The north slope of Baiyun Depression possesses a special sequence stratigraphic model.Its stratigraphic gradient is lower and has no shelf break.Fault activities make the throw of fault acting as shelf break

and cause its lowstand system trace to have the characteristics of type-1 sequence of steep slope.The slope consists maimly of basin fan

incised valley and fillings.This new sequence stratigraphic style is called fault controlled type-1 gentle slope sequence.