basement complex

basement complex

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.

Origin:
1895–1900
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Basement complex is always a great word to know.
So is soil. Does it mean:
to dissolve out soluble constituents from ashes and soil by percolation
portion of the earth's surface consisting of disintegrated rock and humus
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