中文翻译与英英解释

【地质学；地理学】标准层。

key:    n. 礁，暗礁(＝cay, quay)。

bed:    n. 1.床，床铺；床位，铺；(动物的)窝；〔比喻〕安乐 ...

In geology, a key bed (syn marker bed) is a relatively thin layer of sedimentary rock that is readily recognized of the basis of either its distinct physical characteristics or fossil content and can be mapped over a very large geographic area.Neuendorf, K.

例句与用法

Study on the key bed theory of roof supporting in stope
采场支撑顶板关键层理论的研究