吉林大学地球科学学院一刘志宏 地质构造现象与岩石变形 5FT hotograph showing fault-propagation fold in which the thrust bends into an upper detachment, with some ment of the fold over the ramp. The higher elevation of hanging wall beds relative to the footwall beds sts strue on by a deeper structure. The fold is in Silurian limestones of the Helderburg Group in the Hudson Valley belt i East is to the left in New吉林大学地球科学学院 —刘志宏 地质构造现象与岩石变形