CONSTRUCTION OF VERTICAL SECTION 1 Select the location of the section and draw a section line(usually perpendicular to the strike of the main structures), right-hand end is its more easterly end 2 Draw a topographic profile along the line of section. Determine the base line on the squared paper and draw a vertical scale line at each end. The base line usually locates at 1-1.5 cm lower than the lowest point along the line. 3 Add the structural data to the topographic profile. Data on either side of the section line may be projected to the section. Note to use apparent dipCONSTRUCTION OF VERTICAL SECTION 1 Select the location of the section and draw a section line (usually perpendicular to the strike of the main structures), right-hand end is its more easterly end 2 Draw a topographic profile along the line of section. Determine the base line on the squared paper and draw a vertical scale line at each end. The base line usually locates at 1-1.5 cm lower than the lowest point along the line. 3 Add the structural data to the topographic profile. Data on either side of the section line may be projected to the section. Note to use apparent dip