岩層
Terrane \Ter"rane\, n. (Geog.) A region or limited area considered with reference to some special feature; as, the terrane of a river, that is, its drainage basin. Terrane \Ter"rane\, n. [F. terrain, from L. terra earth.] (Geol.) A group of rocks having a common age or origin; -- nearly equivalent to formation, but used somewhat less comprehensively.