Wellpreserved weathering crust is discovered at the top of the Changxing Formation in Huangzhishan section, Huzhou, Zhejiang. The characteristics of the weathering crust are described in this paper. The unconformity represented by the weathering crust is located at the lowermost part of Clarkina meishanensis meishanensis Zone. In stratigraphic horizon, it can be correlated with the bottom of the Bed 25 at the Meishan Section D and is coincident with the main episode of the mass extinction at the endPermian. Therefore, it is very significative for discussing the sealevel change and the causes of the mass extinction at the endPermian to study the weathering crust in detail.