In Guangxi, up to 35 m thick and ~50-180m in diameter calcimicrobial Renalcis -Epiphyton mounds of the upper Yongshien Fm. near  Miaomen and Zhaijiang, have their surfaces intersected by sediment-infilled fissures showing contemporaneous erosion (Yu & Shen, 1998). Inter-reef sediments with gastropods, ostracodes and forams indicate a restricted peritidal setting for these reefs. 