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The Coal Measures Strata are divided into 1 super-sequence and 3 sequences on the basis of paleostructure surface,widespread overlap unconformability,coal seam,and channel lag deposit.

古构造运动面、大面积超覆界面、层和河床滞留沉积将含岩系1个超层序和3个层序。

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Then, to reach the buried coal seams, explosives are used to remove up to 800 feet of mountain elevation.

然后, 为了到达埋藏的煤层,使用炸药移除达 800 英尺的山体度。

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You will then walk along the low passages cut in the coal seam, and you will see men with pick-axes breaking down and cutting out great blocks of the coal.

然后你就可以沿着煤层中开凿的巷道见人们拿着镐头,把大块的煤砍下来,挖出来。

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