U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Regional-scale environments of deposition for the Middle to lower Upper Sillurian. For a more detailed explanation, contact Blaine Cecil at bcecil@usgs.gov    
Figure 30. Regional-scale environments of deposition for the Middle to lower Upper Sillurian.
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip3/fig30.html
For more information, contact Blaine Cecil
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