In the reduced sea-bottom water, the reduction of sulfate caused by anaerobic bacteria, which provide S2- as a precipitator, controls the formation of syngenetic sulfide facies.

• 在还原性海底水域中,厌氧细菌引起的还原作用提供了沉淀剂S~（2-）。 这种作用控制着同生硫化物相的形成。