“龙山系”一般有广义和狭义两种概念,前者指前泥盆纪,后者指前震旦纪或前寒武纪,使用地区原以两广为限,随后一度泛用到湘南及赣南。从岩性上说,各处所见,都是一套浅变质岩系。在湘南地区,这套岩层在旧的1/100万全国地质图长沙、桂林幅中的地质符号是:(L),表示其为“龙山系”或与之相当;在旧的 The “Longshan system” generally has two broad and narrow sense. The former refers to the Pre-Devonian and the latter refers to the Pre-Sinian or Precambrian. The area originally used was limited by both Guangdong and Guangxi, and was once widely used in southern Hunan and southern Jiangxi. From a lithological point of view, seen everywhere, are a set of shallow metamorphic rocks. In southern Hunan, the rock formation in the old 1/1 million national geological map of Changsha, Guilin, the geological symbol is: (L), said that it is “the Longshan” or equivalent; in the old