Abstract: The worms and small shell fossils have been found in the Cambrian Getun Formation of Southern Liaodong Peninsula, which stand for the roof sequence of the Cambrian system (collectively referred to as Newfoundland Series).Two graptolite zones are existed at the border of Cambrian and Ordovician, the lower one is Dictyonema kelanense range zone, while the upper one is Airograptus furciferus-Staurograptus assemblage zone, which are similar to the Chinese Cambrian graptolite and the Dendrograptus erectus minor belt (layers) in graptolite sequence referred by Lin Yaokun (1980), including the Dictyonema kelanense. And these two graptolite zones serve as the floor sequence of the Cambrian system (generally referred to as the upper part of Furongian Series). Since the book of "Rock Formation in Liaoning Province (1997)" was released, the term of "Mantou Formation" was continued to be use, which has been divided into Dahouhai, Shiqiao and Dangshi sections from floor to roof, with three distinctly lithology. In early 1907, Willis and Blackwelder named the strata of Mantou Mountain in Shandong Province as the shale of Mantou Formation when they proposed the term of "Mantou Formation". Thus, this article suggests that the lithostratigraphic unit of Damantou Formation should be replaced by the Mantou Formation, Maozhuang Formation and Xuzhuang Formation.