Many Marine transgressions occur across coastal plains.
许多海运是横越滨海平原。
These fossil data indicate the changes in regional vegetation in response to climate variations and Marine transgressions and regressions.
这些孢粉化石资料说明区域性植被响应气候演变、海进、海退等所发生的变化。
On the basis of an analysis of the lithology, facies indicators and biological features, it is considered that two Marine transgressions took place during this period of time.
本文根据对官地亚组岩性、相标志及生物特征分析，认为官地期曾发生二次海侵。
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