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

Dike of porphyritic basalt exposed at Stop 4 just north of the Hull residence. For a more detailed explanation, contact Jonathan Tso at jtso@radford.edu.
 
Figure 22. Dike of porphyritic basalt exposed at Stop 4 just north of the Hull residence. Co-author (Matchen) visible in the photograph is 1.8 m (5.9 ft) tall.

 

 

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip4/fig22.html
For more information, contact Jonathan Tso
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