Theoretical formula for sediment compaction capacity Δh=h(n 0-n)/(1-n 0) is infered. Main factors resulting in tops leight of Q 2 3 sea facies in coastal accumulation plains is lower metres to tens metres than remains leight of paleo sea level on rock coast are:1 compaction of sediments

2 paleo landform is eroded and droped by running water in low sea level in glacial epoch;3 structure dropping in some areas. The three factors have been progressively resolved

paleo sea level

rise and fall on the paleo landform and capacity of the structure dropping can right have been define.