In temporal sequence, their sedimentary environment changed from abyssal-bathyal to shallow sea to sea-land alternation finally to land facies.They also reflect that the basin became shallower upward.

• 时间序列上表现为深海、半深海-浅海-海陆交互-陆相沉积特点，亦表现为沉积盆地向上变浅的规律。