Abstract: The paper outlines the geology of the southeastern margin of the Sanshui Basin and drilling stratigraphic Section of Baizhushan Formation in Jinjishan district, Central Guangdong Province, as well as the enclosed. fossils in the former region, newly established Lunjiao and Xiaolao Members are equivalent to the lower and middle-upper portions of Baizhushan Formation respectively, on the basis of fossils, mainly charophyta, spore and plant. the chronologic age of Baizhushan Fromation is identified as late stage of Eearly Cretaceous and the fossils like Estheria etc, by which the Formation has been recognized as Middle-Late Jurassic for a long time, are not present.