Specifically, they looked at the remains of microscopic shell-forming organisms known as foraminifera.

具体而言，他们看到了微壳形成的被称为有孔虫的生物体遗体。

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The combinatorial types of reef-forming organisms and reef-inserted organisms were fairly different during different geological periods, and the reefs varied respectively in type, size and feature.

不同地史时期造礁生物及其附礁生物的组合不同，形成的礁体具有不同的类型、规模和特征。

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