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.
结果表明其由核心和叠层石包壳组成，具有核形石特有的结构和构造。
The structure and texture found in these nodules are characteristic of oncolite.
从生物岩的角度提出深海锰结核（锰质核形石）的描述方法及所用术语。
The method and terminology for describing pelagic manganese nodules (oncolites) have been suggested based on their biogenic origin.
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