on the dead Delta depositional environment is the brackish and freshwater marshes. The process of sinking sunk occur continuously so swamps gradually extended the area for growing vegetation, buried and later turned into the peat fields, then into the seams of brown coal, coal. This is the thầng mark in identifying and linking. Other than the General organic Pearl's strong accretion is the horizontal stability, on the other hand the popular General here has different dimensions and develop lignite coal
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