Figure 4A. Layers in granite at the Mosquito Mountain quarry. The thin, black streaks are concentrations of heavy mineral grains that accumulated on the side of the magma chamber as it was solidifying to form granite. The series of layers formed in sequence from left to right as the molten rock cooled, until eventually the entire body of magma had solidified to granite. Geologist Dan Lux of the University of Maine, shown here, has co-authored a paper describing some of the granite structure at this quarry. (MGS photo.)

Figure 4A         Figure 4B        

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Last updated on July 17, 2006

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