| 单词 | pre-laurentian | 
| 释义 | > as lemmaspre-Laurentian   pre-Laurentian adj.  Brit.  , U.S.  ΚΠ 1875    J. W. Dawson Nature & Bible 76  				The Earth's crust thrown into folds, The first continents. Pre-Laurentian vegetation, known only inferentially. 1935    Science 22 Feb. 186/2  				Do ordinary field studies give us even the basis for a poor guess that these schists are in reality Archean, in the sense of being pre-Laurentian? < as lemmas  | 
	
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