The Dongdacun Formation consists in ascending order of alluvial fan debris flow deposits, barrier-free clastic littoraldeposits and shallow-water carbonate platform tidal-flat deposits.
东达村组自下而上为冲积扇泥石流沉积、无障壁碎屑滨岸沉积和浅水碳酸盐台地潮坪沉积。
2
After Late Norian of the Late Triassic, water retreated from north and west, and sea-continental transitional and littoral terrigenous deposits covered the whole area.
晚三叠世诺利晚期以后，海水自东向西退出，海陆过渡相与滨岸陆屑沉积广泛覆盖全区。
3
In this paper the genesis and formation periods of the placers (littoral, glacial and alluvial) and biogenic-biochemical sedimentary deposits are briefly discussed.