All these indicate that calcareous algae can be an important source material for natural gases.

这表明钙质藻类可能是天然气的一种重要母质来源。

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The walls of some algae differ, e. g. the silica boxes enclosing diatoms, and the calcareous layer on the cell walls of calcareous algae.

一些藻类的细胞壁的化学成分有所不同，例如硅藻属的细胞壁含有硅化物，石灰质藻类的细胞壁含有钙。

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The Siberian Platform is the model for studies of a history of development of calcareous algae that appeared in abundance at the transition from the Late Proterozoic to the Early Cambrian.

西伯利亚地台的新元古代到早寒武世间的钙藻化石特别丰富，为研究钙藻化石的发育历史提供了模式。

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