Figure 4. Dark colored dike of igneous rock cuts across the light colored metamorphic rocks. The dike formed when magma at depth intruded along a fracture. The walls of the dike were spread apart as the magma came into it. There is a jog in the dike because the fracture was not straight. Highlight dike. (MGS photo by Henry Berry.)

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Last updated on January 4, 2008

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