It comprises blocks of crystalline basement (Archean to Lower Proterozoic) with folded metamorphic basement (Middle to Upper Proterozoic), Palaeozic volcano sedimentary rocks, and a Mesozoic to Cenozoic cover.

• 该区主要由古生界的沉积－火山岩系组成，局部含太古界至下元古界的结晶基底，覆中新生界盖层。