surface key bed 地表基准层
pyroclastic key bed 火成碎屑物键层
Event key bed 事件标志层
Key bed method 标志层法
At the section with non lithology key bed, the key bed could be selected according to the lithology combination and the particle variation.
在无岩性标志层的层段,则根据岩性组合及粒度变化选择标志层。
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