The microbialites of Chongyang in Hubei Province occur above the mass extinction line in the Late Permian reef facies. Below the boundary are the sponge reef limestone, crinoid limestone and alga-foraminifer bioclastic limestone of the Changxing Formation. The microbialites are generally composed of mid-coarse grains and microlite calcite with a structure of “graniphyic fabric” and stromatolite. The fossils discovered in the microbialites include globular cynobacteria, ostracods, micro-gastropods, bivalves,...
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