Coal deposits, after all, are petrified peat swamps, and peat is made from decaying plants, which leave their imprints in mud and clay as it hardens into shale stone.
毕竟煤炭矿床本身就是石化的泥炭沼泽，而泥炭的成份是腐烂的植物。当粘土泥浆逐渐硬化成页岩石，腐烂的植物则在上面留下了它们的印记。
The coal measure facies can be divided into five ones such as dry peat marsh, moist forest peat marsh, transitional margin marsh, living water peat marsh and open water facies.
根据煤系有机相研究分析，可以划化分为干燥泥炭沼泽相、潮湿森林泥炭沼泽相、过渡边缘沼泽相、活水泥炭沼泽相和开阔水体相五种有机相。
Marine transgression resulted in the forming of swamp and then the peat swamp. And the transgression later on put the peat formed in advance in deep water environment to form coal in the end.
海侵导致了陆表海盆地沼泽环境的形成，进而形成泥炭沼泽，而随后的海侵事件导致了先形成的泥炭迅速处于深水环境最终成煤。
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