| 单词 | passage bed | 
| 释义 | > as lemmaspassage bed   passage bed  n. Geology a stratum exhibiting a transition from one formation or rock type to another. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > 			[noun]		 > stratum > transitional stratum passage bed1846 1846    Q. Jrnl. Geol. Soc. 2 129 		(note)	  				By ‘passage beds’ are meant the highest beds of the Caradoc sandstone. 1955    Jrnl. Ecol. 43 74  				This material occurs as a passage-bed varying in thickness.., overlying the Northampton Sand. 1992    Proc. Yorks. Geol. Soc. 49 155/1  				The Passage Beds form the lowest member of the Coralline Oolite Formation (Corallian Group) in North Yorkshire. < as lemmas | 
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