In Lianyuan and Lengshuijiang cities, HunanProvince, the Serpukhovian-middle Bashkirian massive lime-stones (about 5 m thick) from the upper Zimenqiao Formation tolower Dabu Formation contain abundant benthic fossils includ-ing fasciculate colonial rugose corals, fasciculate tabulate corals,and chaetetids. They locally form bounded frameworks whichresemble the contemporaneous reefs in Akiyoshi, Japan. Besides, stromatolites also occurred in Lianyuan-Lengshuijiang areas during this time