Based on isostasy principle, this paper made out a correction method for the calculation of disconformity erosion amount.

考均衡效应，可以对传统的层剥蚀量计算方法进一步修正。

Cumulate plagioclase appears abruptly at the base of the F unit, which rests on an erosional disconformity .

堆积的斜长石在位侵蚀假整合之上的F单元的基底突然出现。