Figure 12.
Samples collected from the Bear Island surface along the Virginia side of the Potomac River show no trend of age with distance downstream. m asl, meters above sea level.
U.S. Department of the Interior
,
U.S. Geological Survey
URL: http:// pubs.usgs.gov /circ/2004/1264/html/trip6/fig12.html
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Last modified: 12:08:31 Fri 06 Apr 2007
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