Just like the oxygen isotopic records, the abundance changes of B. scutum indicate the glacial and interglacial cycle and at the same time can be considered as a tool for the stratigraphic classification and correlation.
其丰度变化基本上与氧同位素记录一样,反映了冰期与间冰期旋回,并且可以作为地层划分和对比的工具。
For the past several million years, Earth has been locked in a glacial cycle.
在过去的几百万年中, 地球被封锁在一种冰期旋回中.
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