Basement complex

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  1. Undifferentiated crystalline, metamorphosed. Often, but not necessarily, Precambrian.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A series of rocks generally with complex structure beneath the dominantly sedimentary rocks. In many places, these are igneous and metamorphic rocks of either Early or Late Precambrian, but in some places these may be much younger, as Paleozoic, Mesozoic, or even Cenozoic. See also: complex Syn: fundamental complex
    Source: Dictionary of Mining, Mineral, and Related Terms

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