It is located near Tiangu Villa in the downstream of Qijiehe River with the height of 280-310m. It belongs to the stratum of Lower Triassic Zhenning Formation (T1yn) and the lithological character is classified into four members from bottom to top: (1) in the first member, grey, dark grey limestone, wormlike limestone, including lamellibranch of medium thickness seam, and argillaceous limestone and marlstone of 8-20m from thin to medium thickness seam at the bottom. (2) in the second member, grey, yellow grey, yellow green and few fuchsia limestone from thin to medium thickness seam, including dolomitic mud rock, sonim, yellow grey, dark grey calcilutite, marlstone, argillaceous limestone, wormlike limestone, and argillaceous dolomite full of lamellibranch of medium thickness seam. (3) In the third member, grey, dark grey limestone, wormlike limestone of medium thickness seam are of stylolite and lamellar layer structure, with less lamellibranch. (4) In the fourth member, yellow grey, grey collapsed breccia, argillaceous dolomite, dolomite limestone with less lamellibranch of medium thickness seam to thick seam.
