Channel one or below.

Older igneous and metamorphic rocks making up the Earth's crust beneath sedimentary cover.

" - - older, usually crystalline igneous and/or metamorphic rock occurring underneath younger stuff.

The igneous and metamorphic rocks that exist below the oldest sedimentary cover. In some areas such as shields the basement rocks may be exposed at the surface.

The oldest rocks recognised in a given area, usually a complex of metamorphic and igneous rocks underlying all the sedimentary formations.

The undifferentated complex of rocks that underlies the rocks of interest in an area.

Metamorphic or plutonic rocks often unconformably overlain by sedimentary rocks.

The undifferentiated rocks that underlie the rocks of interest in an area.

Non-prospective rocks underlying a sedimentary basin.

The oldest rocks recognized in a given area; a complex of metamorphic and igneous rocks that underlies all the sedimentary formations. Usually Precambrian or Paleozoic in age.

Underlying rocks considered to have little potential to host hydrocarbons are treated as the economic ‘floor’ or basement.

Harder and usually older igneous and metamorphic rocks that underlie the main sedimentary rock sequences (softer and usually younger) of a region and extend downward to the base of the crust.

group of crystalline or crystallophyllian rocks doing the background on which ly trangressi and/or unconformably overlie younger sedimentary series.

refers to very deep, ancient rocks that underlie the continents and oceans.

The surface beneath which sedimentary rocks are not found; the igneous, metamorphic, granitized, or highly deformed rock underlying sedimentary rock [LCOTE

Complex of igneous and metamorphic rock that underlies the sedimentary rocks of a region.

Usually synonymous with the Precambrian but the term may also be applied to any widespread association of igneous and metamorphic rocks which are covered unconformity by unmetamorphosed sediments

In geology, the terms basement and crystalline basement are used to define the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way the sediments and/or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".