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pluton
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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igneous rock
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pluton

igneous rock
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pluton, body of intrusive igneous rock the size, composition, shape, or exact type of which is in doubt; when such characteristics are known, more limiting terms can be used. Thus, plutons include dikes, laccoliths, batholiths, sills, and other forms of intrusions. Most plutons are thought to be the result of igneous activity in which a magma is involved; the controversial origin of some large granitic bodies, however, requires that metasomatic processes or granitization be included when discussing many plutons.