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A composite igneous intrusion like this can be immense encompassing tens, or in the case of a batholith, several hundred individual plutons. When erosion eventually strips away the several kilometers of rock covering the batholith, the massive plutonic rock remains as an elongate mountain range. Representative Image: Igneous intrusion. In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth. Plutons include batholiths, stocks, dikes, sills, laccoliths, lopoliths, and other igneous formations.