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: https:// pubs.usgs.gov /circ/2004/1264/html/trip6/fig12.html
For more information, contact
Reston Publications Service Center
Last modified: 12:24:44 Wed 23 Nov 2016