Figure 6. Strongly foliated quartz diorite (Dqd in Figure 5), road cut at north end of Georgetown Island. Foliation is defined by thin partings rich in biotite. A sample was taken from this locality for U-Pb dating of the pluton (376±3 million years; Hussey and Berry, 2002). (Photo by Arthur M. Hussey II)

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Last updated on December 1, 2009

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