Cover Story：Field deformation characteristics of detachment faulted zone and microfabric features of ductile shearing in Jiepai on the western margin of the Hengshan Mountain, Hunan Province. Based on a through study of the structure and kinematic characteristics of the detachment faults on the west-ern side of the Hengshan metamorphic core complex, the researchers have confirmed the fact that the detachment faulted zone experienced the evolution from deep ductile deformation to shallow brittle deformation. U-Pb age of zircon from mylonitized albitite in the detachment zone is dated at 137 Ma, the epoch of the transform of Late Mesozoic in South China from a shortened tectonic body to an extension system is restricted, and the age of the lower limit of the Cretaceous red bed basin is con-strained. All these results provide important evi-dence for the evolution of Mesozoic intracontinental orogenic movement. The research achievement directed by Professor DONG Shu-wen of CAGS and Professor ZHANG Yue-qiao of Institute of Geome-chanics, CAGS, ranks the second among “Top Ten Scientific and Technological Progresses of CAGS in 2011”. For details, see page 257-279 of this issue. (photo by ZHANG Yue-qiao)