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June 26-27, 2001
Richmond, Virginia

Possible Hydrogeologic Unit Classification System

The following regional classification system was proposed as a means for defining hydrogeologic units in the Piedmont/Blue Ridge region during the workshop. 

 
Hydrogeologic Unit
Level I Level II Level III
Granites Foliated

 Unfoliated

  
Layered Quartzofeldspathic Schist & Gneiss Low Grade  
  • Inclined Foliation
  • Subhorizontal Foliation
Higher Grade  
  • Inclined Foliation
  • Subhorizontal Foliation

 
Mafic Schist & Gneiss Low Grade

 

  • Inclined Foliation
  • Subhorizontal Foliation

 
Higher Grade  
  • Inclined Foliation
  • Subhorizontal Foliation

 
Mesozoic Basins Sedimentary  
Crystalline  
Contact: dlnelms@usgs.gov
U.S. Department of Interior, U.S. Geological Survey
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URL: http://va.water.usgs.gov/PiedWkshop/hydrogeol-units.htm
Last modified: August 03, 2001 09:49:16 AM 		Link to FirstGov