平邑盆地下第三系官中段核形石较为发育，类型多样。
Many types of oncoids are well developed in the Middle Member of the Guanzhuang Formation of Eocene in Pingyi Basin.
平邑石膏矿主要分布于第三系卞桥组地层中，为陆相湖泊沉积型。
As terrestrial deposits, Pingyi Gypsum mine is mainly distributed in EgB.
本文以平邑石膏矿两次大的冒顶事故为资料背景，分析了矿柱、顶板系统的破坏机理。
With the two great roof-fall accident of Pingyi gypsum mine, this paper analyzes the stability of pillars and roof system and the mechanism of destruction of pillars and roof.
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