Geol.
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.
[ 1895-1900 ]
Geol.
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.
[ 1895-1900 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012