长江三峡下游起始点西陵峡口处于著名的黄陵大背斜东翼,山水洞泉浑然一体,悬崖中间有一个溶洞。唐元和十四年(公元819年)白居易、元稹、白行简三人到此游览,故名三游洞。后宋代苏氏三父子、欧阳修、黄庭坚、陆游等先后到此赋诗唱和,千余年来大量的文学书法作品记录在三游洞摩崖石壁之上(图1)。但石壁形成的年龄比石刻要早的多,古生 Xiling Gorge, the starting point of the lower reaches of the Three Gorges of the Yangtze River, is located in the eastern wing of the famous Huangling anticline. The water springs in the mountains are seamless and there is a cave in the middle of the cliff. Tang Yuan and fourteen years (AD 819) Bai Juyi, Yuan Zhen, white line Jane three people to this tour, hence the name three travel hole. After Song Su’s three sons and daughters, Ouyang Xiu, Huang Tingjian, Lu You, etc. have endowed with poetry and singing, a large number of literary and calligraphy works over the past three thousand years recorded in the Three Cliffs Cliff Cliff above (Figure 1). However, the age of stone wall formed earlier than the stone, paleontology