Abstract:

Four fossil reef communities can be differentiated from Kefeng reef,Longlin region,Guangxi,in which three communities belong to Middle Permian (from Misellina zone to Neoschwagerina zone),and one belongs to Late Permian (Palaeofusulina zone).Many ofthe 25 genera and 38 species found here are restricted to Sphinetozoa,Inozoa and Scle-rospongiae.Baesd on the general characteristics of the communities,the sequence of Ke-feng reef can be divided into four distinct reef-cycles.And these cycles are correspongding to the flourish of the reef-building sponge communities.Some statistical data suggest that the size and form of calcisponges can indicate different environment.In general,those sponges lived in a higher-energy water are always smaller in their form and denser in distribution.The binding organisms play an important role in reef development.They are very abundant in quantity and important to the build-ing up a typical reef.