There are plenty of traditional methods to calculate denuded amount of Prototype Basin

but the results of these methods can hardly reflect the real reason of lacuna.The wave analysis method is based on the principle from knowing to unknowing to establish the wave equation by sedimentary rate histogram of residual stratum in geological time profile

and then find out the periodic wave of stratum deposited in different stages

judge the reason and the amount of sedimentary lacuna.To use this new method

one have to select the study areas as evenly as possible first

then change the lithologic-thickness sections into lithologic-time sections according to original data analysis

and finally plot sedimentary rate curves

restore stratigraphic denudation amount.The method was used to analyse the Huayong Formation in Sanshui Basin.The results suggest that there had been sediments of Late Oligocene and Neogene

but all were denuded.The present boundary of the Sanshui Basin was acturally formed after 39 Ma