Figure 4.
Mafic dike intruding the Occoquan Granite at Stop 3.
U.S. Department of the Interior
,
U.S. Geological Survey
URL: http:// pubs.usgs.gov /circ/2004/1264/html/trip1/fig4.html
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Last modified: 12:07:46 Fri 06 Apr 2007
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