Definition: The term "coalface" is a technical term in the field of geology and geophysics that refers to a type of rock formation known as a metamorphic intrusive igneous rock. These rocks are typically formed when magma or lava rises from below the Earth's surface and cools rapidly, causing it to solidify into a rock that resembles coal. In the case of coalface, the term is used to describe the layer of rock above the base of an intrusive igneous intrusion (like
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