Formation of karst cave system and its relationship with neotectonic movement in Beijing Western Hills, Beijing, China.

The strata formed karst in North China are mainly composed of Majiagou Formation in Ordovician and dolomite with siliceous bands of Wumishan Formation, Jixian System in Middle Proterozoic. The local Fangshan landform is made up of Pliocene stone forest on mountain top and Quaternary karst stone cliffs, all formed within Wumishan Formation. Karst caves are either developed in Majiagou Formation or Wumishan Formation. Shihua Karst cave system along the south bank of Dashi River consists of Jimao Cave, Yinhu Cave, Shihua Cave, Qingfeng Cave and Kongshui Cave, connected by an underground river. Shihua Cave system is developed on top of Majiagou Formation in northeast uplifting limb of Beiling syncline. There is Fangshan granodiorite between Shihua Cave system and another Karst Cave system of Peking Man Site at Zhoukoudian. Eight altitude levels of Shihua Cave system represent corresponding times of the neotectonic movement in Beijing Western Hills. It may correlate with Physiographic Stages of North China and terraces of Yongding River.