[continued from previous message]   
      
   the residual soil above the light-colored bedrock. Comparing the   
   density of spherules in the soil to that in the bedrock may give a good   
   indication of how much of the bedrock has been eroded to create the soil.   
   --   
   Tim Demko   
   http://www.d.umn.edu/~tdemko   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)