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。
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。
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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