一、褶曲的一般特征谷积山箱形背斜位于京西房山县之北,成东西向延展,长达17公里。该背斜在鲁家滩以南由两个背斜组成,向东宽度变窄,到大灰厂以北合并成一个背斜,并向北东东倾伏。在背斜倾伏端处发育有许多小型构造,它们与主体构造有密切的联系。 First, the general characteristics of fold Guggen Hill box anticline is located in the west of Fangshan County in Beijing West, into the east-west extension, up to 17 km. The anticline is composed of two anticlines to the south of Lujiatan. The width of the anticline is narrowed to the east, merged into an anticline to the north of the large ash plant, and tilted to the east of the north. There are many small structures developed at the beveled ends of the anticlines, which are closely related to the structure of the main body.