Many geologists have proposed that there are two kinds geological background and ways for the evolution and formation of the peat bogs, i. e. One way occurring from water body environment called" water bog-forming", the other comes from land environment and called" land bog-forming". In the paper, study shows that although there are only two types of original environments, there another evolution way for peat bog-forming besides the two mentoned above. According to the bog-forming process, the third way of bog-forming, a mixed way, is alternatively change of water body and land environments, called transfomed bog-
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