Danxia Landform of Fangyan which located in Yongkang Basin belongs to South China fold system in geotectonic framework, which made fringes of continent become activities again while the Pacific Plate dived under the Eurasian Plate in the period of Yanshan Tectonic-Movement. The ruptured Yongkang Basin was formed as tectonic stress field changing extrusion of NW-SE to extension of NW-SE from Later Jurassic to Earlier Cretaceous, so strata of Guantou Formation (K1g), Chaochuan Formation (K1c), and Fangyan Formation (K1f) of Yongkang Group in Lower Cretaceous were accumulated in the Basin. In Late Mesozoic, the Yongkang Basin uplift gradually, the red-layer sediments ended accumulating and suffer from erosion. The characteristics of the earlier developed stage in Fangyan such as dense encircled valleys, mesas and aisle-liked caves prove that the large-scale uplift tectonic movement in this area should occur in recent geological epoch.
