China - Heaven Pit and Ground Seam Scenic Spot

The Heaven Pit and Ground Seam Scenic Spot is a part of Qiyao Mountain range and the geodetic structure is located in the extension part of the upward and folded zone of Sichuan, Hubei, Hunan and Guizhou at the west edge of Wuyi Mountain-Xuefengshan Mountain folded zone in Neocathaysian structural system. The direction of structural line is NE-SW. It is a typical landform of shallow-medium cut platform peak-cluster depression. The emerged strata are the medium-thick strata in Jialingjiang formation of the lower series in Triassic system, with little thin limestone interbedding, and gradually ascended in three steps from southwest to northeast. The karst hydrogeological system of Xiaozhai Heaven Pit-Tianjingxia Ground Seamis composed of the wider valleys on its upper reaches, the gorges, water discharging holes and ground seam on its middle reaches and the underground river and heaven-window funnel on its lower reaches, the drainage area of the system is 230 km2, the height difference between the head and the tail of the system is 1700m, and the whole length from the head to the tail of the system is about 37km