The Upper Pleistocene in northern Hebei is divisible into the Qian an Formation and the Malan Formation.
冀北晚更新世地层划分为迁安组与马兰组。
Using historical geology standpoint, analyzes the sequence of fault formation in Malan minefield, summarizes the law of distribution and extresion of Malan minefield faults.
用地史学的观点分析了马兰井田断层形成的顺序，总结了马兰井田断层的分布和延伸规律。
By analysing the cause, course of formation exposed caved pillar in Malan mine, summarizes some law and applies it for production.
通过对马兰矿南四采区已揭露的陷落柱的成因、形成过程进行分析，总结出某些规律，并在生产中加以应用。
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