underlying strata

基本解释

There exists a large-scale transgressive onlap boundary between the Langshan Formation and its underlying strata.
证实郎山组与下伏地层之间存在一大型海侵超覆界面；
It is revealed that the lead in the deposit is mostly derived from the volcanic rocks and partly from the underlying strata.
矿床中的大多数硫由火山热液提供的，部分来自海水。
The subaerial and subaqueous volcanic rocks have significant differences in lithology, texture and structure, alteration, occurence, contact with underlying strata, pore and fissure development.
在充分考虑火山岩储层特征和地层非均质性的基础上，运用常规测井信息、气测录井及测井新技术对火山岩储层进行综合评价。