noun
1. : the assemblage of metamorphic and igneous rocks underlying stratified rocks in a particular region
2. : the Archean rocks — compare fundamental complex
noun
1. : the assemblage of metamorphic and igneous rocks underlying stratified rocks in a particular region
2. : the Archean rocks — compare fundamental complex
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012