Figure 4.
Mafic dike intruding the Occoquan Granite at Stop 3.
U.S. Department of the Interior
,
U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip1/fig4.html
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Last modified: 12:24:04 Wed 23 Nov 2016
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