Plate 12. A, combination lithologic percentage; 

 B, electrical; and C, interpretative well logs. 

 The interpretative log is based on data secured 

 from the percentage and electrical logs. Note the 

 readjustment of lithologic boundaries as shown 

 on the interpretative log. Considerable interpre- 

 tative information is lost if a percentage log is 

 not plotted. 



