All these indicate that calcareousalgae 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。
2
The walls of some algae differ, e. g. the silica boxes enclosing diatoms, and the calcareous layer on the cell walls of calcareousalgae.
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。
3
The Siberian Platform is the model for studies of a history of development of calcareousalgae that appeared in abundance at the transition from the Late Proterozoic to the Early Cambrian.