Liberal Dictionary English Dictionary
noun Geology.
- the undifferentiated assemblage of rock (basement rock) underlying the oldest stratified rocks in any region: usually crystalline, metamorphosed, and mostly, but not necessarily, Precambrian in age.
Geological Map of Nigeria showing Basement Complex and Sedimentary
File:Basement Complex, Leeds (24th June 2010).jpg – Wikimedia Commons
Geological map of Nigeria showing the basement complex, younger