The Langshan area may be subdivided into the Main and Southern Langshan.
The Main Langshan basements were mainly formed during Neoarchean–Paleoproterozoic.
The Main Langshan probably belongs to the Yinshan Block in northern NCC.
The late Paleoproterozoic and Neoproterozoic basement rocks exist in the Southern Langshan.
The Southern Langshan probably belongs to the Alxa Block.