Intro | Description | Physical Data | Geophysical Data | Construction
 
  Intro | Section Line | Topographic Profile | Surface Geologic Data | Subsurface Geologic Data
 
  With the topographic profile completed, it is now necessary to transfer the geologic information on the surface from the map to the cross-section. Starting with a new blank piece of paper or the one with the topographic marked on it, lay the paper along the line of section again. To add the geology, do the following:
 
  • transfer the control points for all the contacts and faults that cross the line of section;
  • at each fault control point on the profile, use the fault dip angle to draw short control lines extending into the subsurface;
    • do not change the fault angle as you project it down
    • use a thicker line for the fault traces than for the contacts
  • using the dip of each unit, project the unit a short distance into the subsurface
    • do not change the thickness of a unit unless you have evidence it changed with depth
    • terminate the proper units where they intersect fault planes
 
 
Adding geology to the cross-section: transferring control points, drawing geology.
 
  In many instances, a geologist does not have data about what the subsurface geologic relations. Thus, this completes the cross-section construction.
  
  Intro | Section Line | Topographic Profile | Surface Geologic Data | Subsurface Geologic Data
 
  Intro | Description | Physical Data | Geophysical Data | Construction
 
 
 
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Copyright @ 2010 J.D. Myers