原石为石英岩,位于古石门隧道西壁。高82cm,宽50cm,“石门”二字字体为隶书,字径约35cm,间距16cm,上下留白,崖面微凹凸,“石”之“口”部右下角泐残,“门”下有斜残痕从左竖画末端入至右竖穿出。 The original stone is quartzite, which is located on the west wall of Gu Shimen Tunnel. Height 82cm, width 50cm, “Shihmen ” two-character font for the official script, the diameter of about 35cm, spacing 16cm, top and bottom of the blank, cliff surface micro bump, “stone , ”Door " under the oblique residue from the left end of the picture into the right vertical piercing out.