“旋回层”用英语怎么说？

砂岩复合体发育于退覆沉积层的旋回层内.The complex of sand bodies developed in a cyclical sequence of off - lapping sedimentary beds.米级旋回层序之顶覆以厚度不等的?These cyclic sequences are overlain by the lagoon dolomitic mudstones and shales....