砾岩层 meaning in Chinese

boulder bed

Surface movement wreck characteristic of mining under thick conglomerate
浅谈巨厚砾岩层下开采时地表移动破坏特征
In order to analysis the paleo - current effectively on the conglomerate , i proposed a method that can be carried out by orthogonal photo in field and statistic analysis at room . it has been improved to be efficient and veracity , especially for the case that the states of gravels can not be measured directly
为了更有效的分析古流向，对砾岩发育地层，提出了野外正射投影照相?室内统计计算的方法，该方法能提高工作效率及分析准确性，尤其适用于野外不易直接测量产状的细砾岩层。