[ ] The Dazhuyuan Formation ( C2d ) in northern Guizhou-southern Chongqing and the Liangshan Formation ( P2 l) in Kaili-Huangping area of southeastern Guizhou are both ore-bearing rock series of bauxite, both of which produce abundant spore pollen. According to the identification of pollen experts and other geological characteristics, the sedimentary age of Dazhuyuan Formation is Late Carboniferous Xiaoyao period, namely Kasimovian-Gescher period. The sedimentary age of Liangshan formation is the early Luodian period of Middle Permian, namely the early Empty Valley period. "China Mineral Geology . Guizhou Volume . Bauxite " ( 2019 ) Chapter 6 " Kaili-type Bauxite ", in the absence of geological evidence, the original Middle Permian Liangshan Formation in the Kaili-Huangping area was dismembered into two parts : the upper part of the original Liangshan Formation, carbonaceous shale, coal seams, quartz sandstone, etc. are still called the Middle Permian Liangshan Formation ( P2l ) " ; the bauxite, bauxite rock in the middle section of the original Liangshan Formation and the iron clay rock and siderite layer in the lower section were changed to the Lower Permian " Dazhuyuan Formation ( P1d ) ", and its sedimentary age was determined as " Early Permian Sakmar-Adingsk period, equivalent to the late purple period-Longlin period in China ". In this way, it will cause confusion to the stratigraphic units of the Middle Permian Liangshan Formation in Guizhou Province, which has been used for many years and has a clear definition, layered and sublayer support, which deserves serious attention.