Shatanzi bayou

formed of "Ω"-shape river cove

is an open sedimentary system.The bayou underwent concave bank collapse

covex bank cumulation and cut-cove bar forming stages.Water inlet and outlet are the main positionsof deposition.The deposit rate is 2-3m per year

but that of the apex of the cove is considerably slow.As for grain size curves

type-Ⅰ represents the grain size of the early stage sediments;type-Ⅱ represents the grain size of the early to middle stage sediments and type-Ⅲ shows that of middle to late sediments.Small or medium size of horizontal

parallel and wave bedding and mud cracks developed in the bayou.