Older geological formations occur principally in the far north where the Junggar Block is geologically part of Kazakhstan, and in the east which is part of the North China Craton.

• 相对年老的地质层组主要分布在遥远的北部和东部，北部的准噶尔盆地的某个区域从地质学上说隶属哈萨克斯坦，而东部的地质层组则属于华北克拉通。