In coal-seam roof, distributary channel sedimentations mostly are vertical accretion, and the continuity of sand body evolvement is well.
顶板分流河道沉积作用以垂向加积作用为主，岩体演化具有较好的继承性；
That implied elm trees may play an important role on the accretion and fixation of sand dunes.
这表明榆树对当地沙丘的形成和固定起主要作用。
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