Sedimentary facies and environments of the Cretaceous Qujiang Group in the Jinhua-Quzhou Basin, Zhejiang

Four types of sedimentary facies have been distinguished for the Cretaceous Qujiang Group on the basis of lithologic associations, sedimentary structures, stratigraphic sequences, depocenter and sedimentary facies changes, including the pediment pluvial facies, fluvial facies, lacustrine facies and fluviolacustrine facies. The Jinhua-Quzhou Basin has undergone three stages of formation and evolution, including the initial stage during the early Zhongdaian, culmination during the Jinhuan, and termination during the Quxianian, as revealed by the general lithology of the Qujiang Group.