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Coalisalwaporelatedtoaccumulatingandburialofrcmainsofplantorlowcranimal-plantandmi-croorganism.Thecharacteristicsofmacroscopicandmicrocosmicmaccral,geologicaloccurrence,pctrologyandmineralogyofcoalmcasuresstrata,lithofaCjcsandpaleoSeo8raphy,8eochcmistryan